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Robb Jensen
04-24-07, 07:54
I built a new upper for my 3 gun AR. Here's what the whole rifle looks like now. It looks a lot like the old one.

I used my Colt unshrouded 1/2 circle carrier, PRI charging handle and CMT bolt from my old upper.

New one has a VLTOR MUR upper reciever, JP V-TAC 12" FF tube, RRA mid-length chrome lined 1x9 barrel reprofiled to .650" behind the gas block. I shortened and ground down the FSB to fit under the FF tube. I finished the gas block in black Moly GunKote and the barrel and FF tube in Norrels tan.

http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics003.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics004.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics002.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics011.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics012.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics013.jpg

Buckaroo
04-24-07, 08:13
Nice! I like how you bi-toned the pistol grip.

What kind of auxiliary sighting device is that mounted at 1:00?

(Never mind I see from the sale posting of your old upper that it is a JP iron sight.)

AR15barrels
04-25-07, 01:58
I built a new upper for my 3 gun AR. Here's what the whole rifle looks like now. It looks a lot like the old one.

http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflepics013.jpg

Shame on you.
A crush washer to index the JP comp?
You should have sent that comp along with the barrel for me to index it perfectly without a mis-matching washer behind it...:p

Robb Jensen
04-25-07, 06:37
Shame on you.
A crush washer to index the JP comp?
You should have sent that comp along with the barrel for me to index it perfectly without a mis-matching washer behind it...:p

I will eventually, I'm still trying to find which comp I like best. I just bought Flatland Forge F2 comp to try next and then I might try the the 'Rolling Thunder' from Benny Hill.

C4IGrant
04-25-07, 13:41
Very nice. How do you like the VTAC tube?


C4

Robb Jensen
04-25-07, 15:07
Very nice. How do you like the VTAC tube?


C4

I love it and just ordered one for my wifes 3gun rifle too.

David Thomas
04-25-07, 17:54
I love it and just ordered one for my wifes 3gun rifle too.

How much practical difference is there in the old one and the VTAC model. I know JP covered the gas tube at the receiver, but other than that is there any real difference?

By the way, nice upper.

Robb Jensen
04-25-07, 19:42
How much practical difference is there in the old one and the VTAC model. I know JP covered the gas tube at the receiver, but other than that is there any real difference?

By the way, nice upper.

Thanks.

The flange on the new one is red loc-tited (per JP instructions) to the upper receiver. You let it dry overnight and then the barrel can be installed the next day. I leave them sitting in the DPMS block with a gas tube alignment tool stuck in it to assure that it's straight. The flange on the new JP isn't the barrel nut, on the old one the barrel nut and flange are the same piece. The old design barrel nut pulls the barrel into the receiver. On the new one the barrel nut threads to the flange and pushes the barrel to the receiver, actually a neat design.

The old FF tube threads on to the bbl nut. The new one is pressed straight on and held with the little screws black screws that you see on mine (less likely to spin loose).

The new one also has an optional top rail that will butt up against the receiver for the continuous rail like the DD Lite Rail does and as you said the gas tube is protected on the new model.

AR15barrels
04-26-07, 01:15
The flange on the new one is red loc-tited (per JP instructions) to the upper receiver. You let it dry overnight and then the barrel can be installed the next day. I leave them sitting in the DPMS block with a gas tube alignment tool stuck in it to assure that it's straight.

Another tip when you install these...

Snug up the barrel nut finger tight against the receiver when aligning the barrel nut on the receiver while the loctite cures.
This will make sure that all the loctite fills the spaces in the threads AND lets the threads bear against each other like they will when tight.

Just make sure you don't accidentally loctite the sleeve into the nut!

Razorhunter
05-01-07, 20:50
gotm4,
What is that sight system you got with the fire orange FSP?
Is that fire orange FSP a standard FSP, that will fit in a regular FSB???
I'm looking for options other than the typical FAT AS HELL tritium FSP's, which are MUCH thicker in width than the OEM FSP's... As if the OEM FSP's aren't fat enough... Thanks.

Robb Jensen
05-01-07, 21:14
gotm4,
What is that sight system you got with the fire orange FSP?
Is that fire orange FSP a standard FSP, that will fit in a regular FSB???
I'm looking for options other than the typical FAT AS HELL tritium FSP's, which are MUCH thicker in width than the OEM FSP's... As if the OEM FSP's aren't fat enough... Thanks.


It's the JP irons sights on a JP rail. I wish they used LaRue levers on the sights because at some matches there's open and limited. And at most non-USPSA matches I'm in Open anyway so why not take advantage of a 2nd optic sight like a Dr. Optic and a bipod.

Robb Jensen
05-07-07, 14:20
Here's a pic of my new Flatland Forge F2 comp. I've got 300 rounds on the upper with this comp now, it's a damn good brake/comp but VERY loud I didn't think it would work too much better than the Cooley comp. It's a quite a bit better by feel and seeing the reticle rise less than with the Cooley is pretty good evidence that it's working better.

Close up of my Flatland Forge F2 comp and the rifles left side, I'm running a Vickers sling on it:
http://img.photobucket.com/albums/v408/gotm4/556pics/vltortube007.jpg
http://img.photobucket.com/albums/v408/gotm4/556pics/vltortube009.jpg

Only the right side is ported for bias, it really tracks straight up and down and doesn't bounce around as much as the Cooley does on this rifle.


Here's 2 pics of my wifes 3gun/side rifle match AR w/JP VTAC.
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunrifle008.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunrifle009.jpg

Logic
05-10-07, 02:22
What sling mount are you using on the Vtac?

Robb Jensen
05-10-07, 04:12
What sling mount are you using on the Vtac?

Blue Force, Vickers 2 point.

Logic
05-10-07, 04:21
I didn't mean your sling, but the QD mount on the VTAC where the front part of the sling attaches to.

Robb Jensen
05-10-07, 04:24
I didn't mean your sling, but the QD mount on the VTAC where the front part of the sling attaches to.

Oh, it's a Midwest Industries (it's the only one we had in the shop when I installed the sling). Daniel Defense makes one too, which I'll use eventually. The 2" rail is a JP made for the VTAC rail.

Here's a latest pic with the DD one on it. I like the DD better it has built in stops that don't allow the swivel to turn all the way around and tangle the sling.

http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunrifleleftside.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/3gunriflerightside.jpg

Robb Jensen
07-12-07, 06:32
Shame on you.
A crush washer to index the JP comp?
You should have sent that comp along with the barrel for me to index it perfectly without a mis-matching washer behind it...:p


For you Randall ! No washer bro ! A friend showed me the Hack-Fu way to getting it to time up without a washer. I timed it so that it's on there with about 12ft lbs and Red Loc-Tite.

http://img.photobucket.com/albums/v408/gotm4/gunpics/82b2da6c.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/914a8b58.jpg
http://img.photobucket.com/albums/v408/gotm4/gunpics/f30e960d.jpg

AR15barrels
07-12-07, 10:56
For you Randall ! No washer bro ! A friend showed me the Hack-Fu way to getting it to time up without a washer. I timed it so that it's on there with about 12ft lbs and Red Loc-Tite.



That's perfect.
How much did you have to file off the end of the comp?

Robb Jensen
07-12-07, 13:27
That's perfect.
How much did you have to file off the end of the comp?

About five thousands or so.

AR15barrels
07-12-07, 17:57
About five thousands or so.

So it was off by 50 degrees or so?

A tip...

Snug down the comp.
Measure the angle required for proper index.
Divide the angle by 10
Remove that much metal.

It happens to work out that 28 TPI is 0.0357" per thread.
Round that to 0.036" and think about 360 degrees in a circle.
Now it becomes 0.001" per 10 degrees of index.

Pretty neat huh?

Steve
07-12-07, 18:26
My head hurts

Robb Jensen
07-12-07, 21:48
So it was off by 50 degrees or so?

A tip...

Snug down the comp.
Measure the angle required for proper index.
Divide the angle by 10
Remove that much metal.

It happens to work out that 28 TPI is 0.0357" per thread.
Round that to 0.036" and think about 360 degrees in a circle.
Now it becomes 0.001" per 10 degrees of index.

Pretty neat huh?

Cool. Thanks, yeah I just did a few swipes with the big file and then would test, then when it got close I used 800grit wet/dry sandpaper, followed by 2000grit and then refinished the end of the comp with Birchwood/Casey Aluminum black and used some red Loc-Tite and tightened it down. It took me about 30min.

AR15barrels
07-13-07, 02:22
I just did a few swipes with the big file and then would test, then when it got close I used 800grit wet/dry sandpaper, followed by 2000grit and then refinished the end of the comp with Birchwood/Casey Aluminum black and used some red Loc-Tite and tightened it down. It took me about 30min.

2-5 minutes on the lathe and the lathe is MUCH more likely to cut a proper square shoulder. ;)