View Full Version : ACOG BUIS clearance
WickedWillis
04-01-15, 14:38
I bought my very first ACOG, a TA31F last night brand new with the standard mount. I have a Magpul Pro flip down rear sight currently on my rifle. I went to mount the ACOG as far back as I could on the rail, just over top of the rear sight, and the front of the sight causes pressure on the scope. I thought it would clear it just fine. So now, I am curious, does this happen on any other rear sights? I would like to have the ACOG as far back as possible due to the little eye relief, and now I am considering buying troy's. Any feedback here or has anyone else had this issue?
Its going to happen with all rear sights. Your solution is at hand. Its called the KRAM from Macedon Defense. Google them.
I'm pretty sure the Matech, KAC 600m, KAC 300m, KAC 600m micro, and KAC 300m micro will all fit under the rear of the ACOG.
WickedWillis
04-01-15, 14:47
Should I worry about this effecting POA or POI though, or is it a known issue that really is not a factor? I am brand new to the ACOG game.
Failure2Stop
04-01-15, 14:50
The base that IG mentioned does work.
Alternately, the KAC Micro rear sights (25650) are built specifically to fit under the COG.
A dedicated USMC marked model (25650-1) are provided to the USMC for that exact purpose.
Alternately, the Matech and Troy rear sights work.
With a LaRue base it fits with KAC and troy buis in my experience.
I am unable to to do the back lock of the larue mount with a PRI rear buis.
WickedWillis
04-01-15, 15:00
The base that IG mentioned does work.
Alternately, the KAC Micro rear sights (25650) are built specifically to fit under the COG.
A dedicated USMC marked model (25650-1) are provided to the USMC for that exact purpose.
Alternately, the Matech and Troy rear sights work.
I think I am going to sell the Magpul sight and pick up a Troy.
rickblaine3
04-01-15, 15:21
Where/how exactly is the rear flip sight interfering with/contacting the ACOG?
Do you mean that you have the ACOG moved back so far that the ACOG mount is touching the "base" of the flip sight (i.e., the stationary portion of the flip sight that doesn't "flip up") so that the ACOG mount can't fully "seat" on the rail?
If that's the case, I don't think a different flip sight is going to help - that is, I don't think any other flip on the market is going to allow you to move the ACOG any farther to the rear.
A different rear sight isn't going to help. The OP mentions that he wants better eye relief. Yes, many sights will fit under the ACOG. But, it doesn't change the fact that you can only move the ACOG back so far before it stops.
So the solution is a small riser (henceforth known as the KRAM) which goes between the mount and the ACOG and allows you to move the sight more to the rear and give you better eye relief (see pic).
http://i152.photobucket.com/albums/s188/iraqgunz/IMG_2591.jpg (http://s152.photobucket.com/user/iraqgunz/media/IMG_2591.jpg.html)
In the event that anyone is curious, I have one on my personal ACOG (this is one of the original prototype 7.0 mounts) and yes it does work and I have not noticed any issues with it.
http://i152.photobucket.com/albums/s188/iraqgunz/IMG_20130226_014325_680.jpg (http://s152.photobucket.com/user/iraqgunz/media/IMG_20130226_014325_680.jpg.html)
A different rear sight isn't going to help. The OP mentions that he wants better eye relief. Yes, many sights will fit under the ACOG. But, it doesn't change the fact that you can only move the ACOG back so far before it stops.
So the solution is a small riser (henceforth known as the KRAM) which goes between the mount and the ACOG and allows you to move the sight more to the rear and give you better eye relief (see pic).
http://i152.photobucket.com/albums/s188/iraqgunz/IMG_2591.jpg (http://s152.photobucket.com/user/iraqgunz/media/IMG_2591.jpg.html)
Short of the LaRue RCO mount (I have one kicking around somewhere in my unused-since-Afghanistan crap pile) which does a mediocre job of the same thing (but that setup basically precludes running BUIS under the ACOG - might as well run BUIS in front of the 'cog, or an offset micro RDS), that's the best looking option I've encountered. That said, the stock TA51 mount can still be ran pretty stupidly far back, even up against KAC or TROY BUIS (I have one of each), the eye relief concerns I have with those optic setups have more to do with the glass than the mounting (but I know I can shoot pretty well, even with the TA31 installing my eyepro into my face).
How about a shorter stock? I've had 4x32 ACOGs for a long time, its 1.5" eye relief never bothered me but then I don't use these scopes with A2 stocks. A fully collapsed SOPMOD stock is just about right for me. If that's still too long, there are stocks shorter than the SOPMOD.
Either that, or mount a red dot sight, or red dot sight AND BUIS built into the ACOG, e.g. TA31ECOS.
http://i75.photobucket.com/albums/i314/Duffypoo/31ECOS.jpg (http://s75.photobucket.com/user/Duffypoo/media/31ECOS.jpg.html)
The KRAM works as designed, it does raise the ACOG (designed to raise as little as possible), then you may not get a good cheek weld, but facial structures differ so it's hard to say till you try it.
entropy1049
04-01-15, 19:43
The LaRue LT 681 RCO mount is a great way to beat the eye relief issue with the TA31...
http://www.laruetactical.com/larue-tactical-acog-rco-mount
firefighter37
04-02-15, 01:10
I have found that my TA31 ACOG mounted on Bobro mount will not fit on top of a Troy backup sight for which reason I got a KAC micro (which I like way more than Troy, except for price.)
entropy1049
04-02-15, 10:01
With the TA31 on the LT681 the Troy Micro flip ups fit nicely.
I'm betting that the new Bobro Lowrider BUIS will clear once they go public.
http://www.ar15news.com/2015/01/07/new-bobro-lowrider-sights/
IMO it only really helps if you aren't running a rear sight. That's due to the single lever design. People should remember that the ACOG was designed to be mounted in the sight channel on an M16A1/2 styled rifle. The flat top was an after thought.
If you want to change the position of the scope, and you are running a rear BUIS, your only real option is to raise the optic and shift it back, which is what the KRAM does.
The LaRue LT 681 RCO mount is a great way to beat the eye relief issue with the TA31...
http://www.laruetactical.com/larue-tactical-acog-rco-mount
entropy1049
04-02-15, 19:29
IMO it only really helps if you aren't running a rear sight. That's due to the single lever design. People should remember that the ACOG was designed to be mounted in the sight channel on an M16A1/2 styled rifle. The flat top was an after thought.
If you want to change the position of the scope, and you are running a rear BUIS, your only real option is to raise the optic and shift it back, which is what the KRAM does.
I definitely agree the best solution is to forego the rear BUIS.
The LT mount does elevate the optic and set it back on the rail, albeit at more expense than the KRAM I would imagine. I like the QD mount however as I also run an EOTech on this rail and like to be able to switch easily between the two.
By disclaimer, I must add that I haven't tried the KRAM.
IMO it only really helps if you aren't running a rear sight. That's due to the single lever design. People should remember that the ACOG was designed to be mounted in the sight channel on an M16A1/2 styled rifle. The flat top was an after thought.
If you want to change the position of the scope, and you are running a rear BUIS, your only real option is to raise the optic and shift it back, which is what the KRAM does.
I concur, the LT RCO basically negates the ability to run BUIS - which is why mine is sitting unused in one of the ACOG 'socks' I have lying around instead of mounted on a carbine.
I did goof around with the TA51 a fair bit, and it does RTZ within 1MOA. I really didn't think it would, but unmounting it and remounting it on my M16 produced no measurable change, and I was still making tiny keyed holes at 36yd and hitting just as accurately at 200yd (considering the accuracy cone of M855 probably dwarfs that).
Amusingly, I think the KRAM would work stacked on the TL RCO mount, but I'd argue that isn't really required.
WickedWillis
04-03-15, 10:21
With the TA31 on the LT681 the Troy Micro flip ups fit nicely.
This is about the position that I currently have it sitting in. I was hoping I could have the ACOG mount basically one slot back, but it would be touching my BUIS. I am going to the range tomorrow, and just shouldering it around the house so far it's not terrible in the position it's at. After shooting if I still don't like it, I will buy the riser setup that IG mentioned, or I will buy a LaRue mount. I am not crazy about the standard large knobs on the stock mount.
How about a shorter stock? I've had 4x32 ACOGs for a long time, its 1.5" eye relief never bothered me but then I don't use these scopes with A2 stocks. A fully collapsed SOPMOD stock is just about right for me. If that's still too long, there are stocks shorter than the SOPMOD.
Either that, or mount a red dot sight, or red dot sight AND BUIS built into the ACOG, e.g. TA31ECOS.
http://i75.photobucket.com/albums/i314/Duffypoo/31ECOS.jpg (http://s75.photobucket.com/user/Duffypoo/media/31ECOS.jpg.html)
The KRAM works as designed, it does raise the ACOG (designed to raise as little as possible), then you may not get a good cheek weld, but facial structures differ so it's hard to say till you try it.
I will be adding an RMR when funds allow in the next month or so. Also to get the proper eye relief for me, I run my Magpul ACS-L extended one click. It's not terribly uncomfortable, and the only reason I have kept this stock is how great the cheekweld is, but it is a bit heavy.
entropy1049
04-03-15, 12:32
This is about the position that I currently have it sitting in. I was hoping I could have the ACOG mount basically one slot back, but it would be touching my BUIS. I am going to the range tomorrow, and just shouldering it around the house so far it's not terrible in the position it's at. After shooting if I still don't like it, I will buy the riser setup that IG mentioned, or I will buy a LaRue mount. I am not crazy about the standard large knobs on the stock mount.
I will be adding an RMR when funds allow in the next month or so. Also to get the proper eye relief for me, I run my Magpul ACS-L extended one click. It's not terribly uncomfortable, and the only reason I have kept this stock is how great the cheekweld is, but it is a bit heavy.
If I werent a bit OCD about keeping my charging handle totally clear, I could buy about 2 notches towards the rear of the rail...you can indeed get your LT and BUIS farther back than I have mine located in the picture. Cinching up the buttock also helps a lot, I've just adjusted to having mine a bit shorter than I did historically. Feels good now that I've adapted.
http://www.gdiengineering.com/store/products/r-com-b-model.html
That mount is an expensive, yet excellent solution, if you need a QD mount. I had one on my ACOG and it worked great.
entropy1049
04-03-15, 14:37
http://www.gdiengineering.com/store/products/r-com-b-model.html
That mount is an expensive, yet excellent solution, if you need a QD mount. I had one on my ACOG and it worked great.
This looks like an excellent mount for the TA31!
I recently switched from the standard LT100 to the no-longer-produced LT622 SDO (right side rear-facing levers), which also has more mounting holes/positions than the standard mount as well I found. It has 5 vs 2 which give you a little more flexibility in mounting position. While I don't have any BUIS clearance issues height-wise, I am as far back as I can go with the Troy right now. I also have a KAC Micro I am going to mount up and try to see if that gives me a bit more clearance to move rearward, either by rail slot, or hole mount. If not then I might give the KRAM #7 a try
http://i854.photobucket.com/albums/ab110/mathis66/Forums/SnW/d18bd399-adc7-4344-8592-e48f06a2d0c7_zpss1svlb39.jpg (http://s854.photobucket.com/user/mathis66/media/Forums/SnW/d18bd399-adc7-4344-8592-e48f06a2d0c7_zpss1svlb39.jpg.html)
Edit - here's the KAC Micro... Allows me a tad more clearance to come back one more position to the last available slot. The KRAM would lift the lower section of the ACOG up/back enough to clear over the KAC it appears... From the fitment pics I think #7 is the way to go.
http://i854.photobucket.com/albums/ab110/mathis66/Forums/SnW/IMG_20150404_211940_zpswi4fpqiw.jpg (http://s854.photobucket.com/user/mathis66/media/Forums/SnW/IMG_20150404_211940_zpswi4fpqiw.jpg.html)
EDIT - Ordered the #7, will post pics when installed, but here's basically the same setup from Macedon Defense's website... The 5.5 would have worked also, but will only allowed the ACOG to move back to the barrel on the KAC Micro - the 7 lets the ACOG come back a bit further over top of the barrel adjuster, if so desired.
http://nebula.wsimg.com/caab33563e74e132a1c096da14d0a9c6?AccessKeyId=41EC5C789880009009A0&disposition=0&alloworigin=1
You won't be disappointed.
I know the guy who wrote this ;)
http://theballisticblog.com/2015/02/03/product-review-macedon-defense-kram/
entropy1049
04-05-15, 15:56
You won't be disappointed.
I know the guy who wrote this ;)
http://theballisticblog.com/2015/02/03/product-review-macedon-defense-kram/
Ok, you guys convinced me. KRAM ordered and on the way. I'll let you know how it works out compared to the LT681 and/or in conjunction with...
The GDI mount is well made for sure, but the height is an issue. The KRAM allows you to mount the ACOG lower because the ACOG hangs off the back end of the KRAM - i.e, there is nothing between the ACOG and the rear flip sight. Both mounting holes are still used.
Ordered the #7, will post pics when installed, but here's basically the same setup from Macedon Defense's website... The 5.5 would have worked also, but will only allowed the ACOG to move back to the barrel on the KAC Micro - the 7 lets the ACOG come back a bit further over top of the barrel adjuster, if so desired.
http://nebula.wsimg.com/caab33563e74e132a1c096da14d0a9c6?AccessKeyId=41EC5C789880009009A0&disposition=0&alloworigin=1
So, KRAM #7 arrived today - not sure if I'm running up against tolerance stacking, or what - but it does not fit over the KAC Micro as pictured on the MD website image linked above...
Here's mine installed - it does move the ACOG back a bit, just not as much as I was expecting, since going back one more "hole" on the KRAM would allow the ACOG rail to hit the sight bridge/barrel of the KAC. :(. Based on the MD photo, I was expecting it to clear the bridge/barrel area.
http://i854.photobucket.com/albums/ab110/mathis66/Forums/SnW/IMG_20150409_124227_zpsl4ejbwlm.jpg (http://s854.photobucket.com/user/mathis66/media/Forums/SnW/IMG_20150409_124227_zpsl4ejbwlm.jpg.html)
A closer look at the clearance (or lack of, I suppose)... I'd also prefer to run up a slot on the rail also to gain a little room in the lever/wheel area.
http://i854.photobucket.com/albums/ab110/mathis66/Forums/SnW/82ba76fe-1d31-407e-ad78-8b8b5d0846f7_zpsawcysa55.jpg (http://s854.photobucket.com/user/mathis66/media/Forums/SnW/82ba76fe-1d31-407e-ad78-8b8b5d0846f7_zpsawcysa55.jpg.html)
I'll try on one of my other rifles to see if same issue persists...
I'll try on one of my other rifles to see if same issue persists...
So, appears to be tolerance stacking issue, or minor rail height/depth issue...we are talking about mm's here...
So, Plan B - here's a revised mount setup, moved the LT forward a bit to gain some lever/wheel clearance, move the ACOG back a hole, and you can see how close it is. I think a little file work on the edge of the KRAM (oops, I mean ACOG Rail) would clean it up. Or maybe I'll file down the bridge of the KAC instead.
Unless someone smarter than me (pretty large demographic :) ) has a better suggestion? I guess one obvious option is to go to the 9mm over the 7mm KRAM...
http://i854.photobucket.com/albums/ab110/mathis66/Forums/SnW/IMG_20150409_135815_zpspfjjl4xm.jpg (http://s854.photobucket.com/user/mathis66/media/Forums/SnW/IMG_20150409_135815_zpspfjjl4xm.jpg.html)
Sorry for flooding thread with pics... :eek:
rickblaine3
04-09-15, 17:59
Is your ACOG mount a LT622 or a LT100?
Is your ACOG mount a LT622 or a LT100?
It's an LT622 SDO.
Just a followup - Macedon Defense folks contacted me through Iraqgunz tonight, we talked on the phone a bit and have decided it's most likely a tolerance issue with some component in the mix... not a large one, as can be seen in the pics - we are talking about a mm here or there. We went over a few options including exchanging for a 9.0. I'm going to shoot it this weekend and get a feel for the position I need, and we are going to go from there after the weekend.
So a nice shout out to Mark at Macedon Defense and Iraqgunz for helping to get us together. :thank_you2:
entropy1049
04-10-15, 11:12
Ok, after some experimentation...
Got my KRAM 7mM. My goal here was to elevate the optic above the bore and set the objective closer to my eye while in my standard shooting position. Before KRAM installation, the TA31 on the LT681 looks like this:
32682
After installing the KRAM 7, when placed as far back on the rail with the BUIS in place without contact, it was this:
32692
Ideally, I'd place it in this position on the rail, but it contacts the BUIS:
32684
Aside from the increase in elevation I was looking for, this only buys me about 10mm aft position shift on the rail without obstructing on the BUIS. Doesn't seem economical.
After some soul searching, and deciding my Troy Micro rear BUIS was the least inexpensive component in the chain, I had at it with the Dremel. After milling a channel for the rear of the TA31 in the Troy, I was able to get what I'd hoped to get with the addition of the KRAM:
32691
Bottom line for me was this. In the end, I still had to take a Dremel to my rear BUIS. Once I did this, the KRAM 7 had the desired effect. My TA31 sits much farther back on the rail and much higher than it did before. I am completely satisfied with the optic in this position, which was my goal.
Please note: this is with the LT681 mount. Your individual situation may differ. Also note that had I gone with the taller KRAM 9, no such mods would be necessary, but couldn't find the KRAM 9 in black.
Of importance is that you do not have the optic/mount contacting the rear BUIS. If you contact Macedon Defense they will exchange your 7.0 for the 9.0 which will help you out.
Ok, after some experimentation...
Got my KRAM 7mM. My goal here was to elevate the optic above the bore and set the objective closer to my eye while in my standard shooting position. Before KRAM installation, the TA31 on the LT681 looks like this:
32682
After installing the KRAM 7, when placed as far back on the rail with the BUIS in place without contact, it was this:
32692
Ideally, I'd place it in this position on the rail, but it contacts the BUIS:
32684
Aside from the increase in elevation I was looking for, this only buys me about 10mm aft position shift on the rail without obstructing on the BUIS. Doesn't seem economical.
After some soul searching, and deciding my Troy Micro rear BUIS was the least inexpensive component in the chain, I had at it with the Dremel. After milling a channel for the rear of the TA31 in the Troy, I was able to get what I'd hoped to get with the addition of the KRAM:
32691
Bottom line for me was this. In the end, I still had to take a Dremel to my rear BUIS. Once I did this, the KRAM 7 had the desired effect. My TA31 sits much farther back on the rail and much higher than it did before. I am completely satisfied with the optic in this position, which was my goal.
Please note: this is with the LT681 mount. Your individual situation may differ. Also note that had I gone with the taller KRAM 9, no such mods would be necessary, but couldn't find the KRAM 9 in black.
rickblaine3
04-11-15, 03:31
Feel free to contact me if you want to exchange your 7.0 for a black 9.0.
That said, as long as the base of the ACOG isn't touching the Troy flip sight now that you've done a bit of dremel work, your set up should be fine.
...and if that's the case (i.e., the base of the ACOG isn't touching the flip sight), I'd just stick with the 7.0 at this point. The difference between the 7.0 and the 9.0 is pretty noticeable with respect to height/cheek weld...and MOST people prefer the 7.0 over the 9.0 if their ACOG mount and rear flip sight allow for it.
entropy1049
04-11-15, 12:37
IG and Mark-
Thanks for looking out guys. With the milling of the rear BUIS the KRAM is working like a charm. The optic sits in an absolutely perfect position on the rail and has no contact with any point on the weapon except for the KRAM. I like the position and don't think I'd swap out now for the "9", though I thank you both for illuminating me to the option. After careful milling, finishing, and touching up with a bit of enamel flat black paint, the BUIS looks like it was made as it appears. And the shooting position and sight picture through the optic are absolutely perfect, no fussing about when it is shouldered. Naturally in perfect position. I couldn't be happier!
Had I gone with the "9" in the first place, and been able to try it and compare to the "7", I'm comfortable I would have chosen the "7 + milling" option anyway. Some folks may prefer the "9" with this particular mount and BUIS, but for me, the KRAM 7 puts my optic right where I want it.
I want to reiterate to readers, the choice to make mods for a desired fit was my preference to get the placement I want with my BUIS. It would not have been necessary to make any such mods had I chosen to use the KRAM 9.
If you've farted around with mounting your TA31 and gotten to the point where you shoulder the weapon and still have to make minute adjustments to get the sight picture you need, the KRAM is the solution to get the optic where you want it with rapid shouldering of the weapon. An elegant yet simple addition to completely correct the single common bellyache with an otherwise phenomenal optic.
32697
rickblaine3
04-11-15, 12:47
Entropy1049,
Great - I'm glad you like it.
Is there any chance you could post a photo or two of the Troy sight in it's current state?
I'd like to get an idea of just how much you had to dremel it to get the 7.0 to work with it and the LT681...
Thanks.
entropy1049
04-11-15, 14:10
Sure thing-some pics after Dremel but before paint, some after/with. WARNING-I'm no photographer...
32698
32699
32700
32701
32702
I removed more metal than was probably necessary, but I wanted to see daylight clearly in the gap...no possibility of contact.
rickblaine3
04-11-15, 16:59
OK - thanks a lot.
Glad you were able to make it work.
There is the POSSIBILITY that I MAY make some 8.0s in the future...which probably would have been perfect.
However, it would also raise the ACOG another 1 mm...and even that difference would probably be noticeable with respect to height/cheek weld. In the end, you'd probably still prefer your current set up anyway.
In case you, or anyone else for that matter, is curious, IMHO the "height/cheek weld" issue is so sensitive with the 4x32 ACOGs because of the short eye relief (1.5 inches vs e.g., 4 inches)...which I think makes sense when you think about the "trigonometry" of the situation.
However, it seems that most people who've tried the KRAM, especially the 5.5 or the 7.0, realize after a bit of time with it that they prefer the ACOG being raised a bit regardless of whether or not a rear flip sight is being used. I THINK this is because it allows them to keep their head in a more upright position, which gives them a bit more "breathing room" between their brow/forehead and the eye piece of the ACOG, while still being able to keep a pretty solid cheek weld.
Anyway, thanks for the pics, and I'm glad like the end result.
entropy1049
04-11-15, 18:20
prefer the ACOG being raised a bit regardless of whether or not a rear flip sight is being used. I THINK this is because it allows them to keep their head in a more upright position, which gives them a bit more "breathing room" between their brow/forehead and the eye piece of the ACOG, while still being able to keep a pretty solid cheek weld.
You hit the nail on the head. Being able to keep my head up and reasonably straight seems to be a key for comfortable two eye/reflex shooting. Even if it didn't set the optic back on the rail, the KRAM is worth its weight simply for the fact that it elevates the optic a bit. Setting the optic back 30mM or so on the rail is just gravy :D.
With the RMR on top of the ACOG, the "7" lifts it just to the point of being comfortable to sight with a chin weld (I shoot AK's as well, so not a foreign concept :p) but don't need any extra elevation to make it a struggle. I'm sure however that due simply to differences in human physiology, for some folks the 8mM would be a welcome addition to the line up.
The "7" on the LT681 with the BUIS modded to facilitate 100% mount lock up on the rail is to me a perfect solution. It's amazing just how much more friendly this optic is to use when it just snaps into proper position. Really loving this set up.
That's an innovative solution to a crappy situation.
Very short eye relief + height-over-bore from piggybacked red dots make for a less than ideal setup for me.
rickblaine3
04-12-15, 19:40
Entropy1049,
One other thing - you MAY want to consider flipping your LT681 around so the lever (i.e., the only lever) is on the left side of the rifle...which will move the lever closer to the "center of mass" of the ACOG/KRAM...which MAY reduce the amount of "stress" (?) on the lever.
I have no evidence at all to support that this is even a potential "issue," but when I use a GDI E-model mount (which is similar to the LT681), I always put the lever on the left for this reason...and it seems to limit how much everything wants to "flex" on the rail.
But again, I do not know if this is an actual concern/issue - just something you may want to consider/experiment with.
32716
entropy1049
04-12-15, 23:18
Entropy1049,
One other thing - you MAY want to consider flipping your LT681 around so the lever (i.e., the only lever) is on the left side of the rifle...which will move the lever closer to the "center of mass" of the ACOG/KRAM...which MAY reduce the amount of "stress" (?) on the lever.
I have no evidence at all to support that this is even a potential "issue," but when I use a GDI E-model mount (which is similar to the LT681), I always put the lever on the left for this reason...and it seems to limit how much everything wants to "flex" on the rail.
But again, I do not know if this is an actual concern/issue - just something you may want to consider/experiment with.
This is a valid point. I was tempted to do this anyway as the lever protrudes out over the ejection port so far and though contact with ejecting brass is unlikely, it's not impossible. Your comment has provided me with the extra incentive to swap the lever around to the left side of the weapon, sitting proximally more under center mass of the ACOG. Done.
Thanks for the tip!
Following up from previous post - turns out I had an early model LT622SDO which is the same height apparently as the standard ACOG LT100 mount (that is, slightly less tall than expected), throwing my math all off. After a few conversations with Mark at Macedon Defense, we got everything sorted out and I'm running the "-A" version now - LT622SDO-A. This brings the math/measurements back in line with what was expected and I'm able to clear the KAC Micro completely, even over the barrel which is the tallest part when flipped down, due to the numbers being embossed around the barrel.
While it doesn't really look like it in this cell phone pic - there is daylight between the ACOG, KRAM 7.0, and KAC Micro Rear Sight. This allows plenty of setback which helps with the limited eye relief immensely. This much setback may not really be required, but I'm posting it configured this way so you can see how much flexibility is in the mounting system. It would probably be more common to run this mounted one rail spot forward.
A big thanks to Mark at Macedon son Defense for working with me over the past two weeks in getting everything squared away. :D
And yes, I know there is no charging handle, I just changed out the rail to the Larue, and am still in mock-up mode bascially, but wanted to get the picture and comments up. :).
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