View Full Version : Colt OEM1 question
Ordered an OEM 1 complete lower off gbroker. (Excluding the trigger guard and stock) Supposedly was a take off. It came with an S marked ambi safety and a six position reciever extension.
The RE and castle nut are staked like my other colts.
Does this sound right? An ambi and 6 position on a 6920 oem?
Thanks
The Colt 6920 OEM1 I purchased six months ago came with a four position receiver extension and did not have an ambidextrous safety.
I purchased a Colt 6920 OEM1 a month ago from Clyde armory. It came with a four position receiver extension and did not have an ambidextrous safety.
Although i did notice that, according to SAW, Colt does manufacture a 6 position RE, I have never EVER seen a factory Colt rifle/lower with a 6 position RE. I would be skeptical.
Im with ya on that. Can the factory staking be duplicated? That square type staking looks like it was machine done!
...Can the factory staking be duplicated? That square type staking....
Yes.
Either with a square punch and a solid whack or with a hydraulic press and a square punch. I doubt anyone would go to that trouble to use it with a press. But I staked screws before (nothing gun related) with a die, punch, and press.
Ordered an OEM 1 complete lower off gbroker. (Excluding the trigger guard and stock) Supposedly was a take off. It came with an S marked ambi safety and a six position reciever extension.
The RE and castle nut are staked like my other colts.
Does this sound right? An ambi and 6 position on a 6920 oem?
Thanks
Is it possible someone reclassified their "Expanse" lower as an "OEM" lower?
How would I determine that?
556BlackRifle
06-05-16, 00:06
How would I determine that?
The expanse use a different hammer. Can you post a pic?
556 is correct, Expanse has low mass hammer vs standard profile. Also has non-reversible safety, but that won't help here since yours is an ambi. There's something different about the mag release also I think - plastic button maybe? Buffer will be unmarked Carbine vs H2 you would normally expect. But hammer should be easy tell. Early Expanses used M4 Carbine LE serials lowers, then they switched to CE-serial'd lowers at some point. I got hoodwinked myself - expected an M4 Carbine LE lower but got an early Expanse - so didn't pick up on the difference - by the time I realized it, it was too late, I had already changed out some parts and had it engraved. so even if I could get Arms Unlimited to take it back, the engraving would kill it. :(. It's still a solid Colt lower, but I though I was getting a M4 Carbine, so still stings. But I'll never buy anything from Arms Unlimited again.
Edit - just went and looked, it has a 4 position receiver tube, just to make things more confusing.
556 is correct, Expanse has low mass hammer vs standard profile. Also has non-reversible safety, but that won't help here since yours is an ambi. There's something different about the mag release also I think - plastic button maybe? Buffer will be unmarked Carbine vs H2 you would normally expect. But hammer should be easy tell. Early Expanses used M4 Carbine LE serials lowers, then they switched to CE-serial'd lowers at some point. I got hoodwinked myself - expected an M4 Carbine LE lower but got an early Expanse - so didn't pick up on the difference - by the time I realized it, it was too late, I had already changed out some parts and had it engraved. so even if I could get Arms Unlimited to take it back, the engraving would kill it. :(. It's still a solid Colt lower, but I though I was getting a M4 Carbine, so still stings. But I'll never buy anything from Arms Unlimited again.
Edit - just went and looked, it has a 4 position receiver tube, just to make things more confusing.
That's a shame, I've had good luck with Arms Unlimited. OP, I helped my cousin pick out his first AR about a month and a half ago, it was an OEM-1 it had a 4 position tube and a standard safety, just like a 6920. Sounds like you might have got took.
Thanks guys. I took a look at the lower. Has full sized S marked hammer and trigger. Hammer had notch in the face/top. H buffer. Lower also has LE.... serial number and the square QR type code on it. I looked on S. Armament and Brownells. The ambi is exactly as shown "Colt Ambi" with allen head. And is S marked. Weird
Wait, doesn't the 6920 SoCom come with an ambi and six position re?
Best thing to do would be send colt and email with your serial number and see if they will look it up to make sure the gun is factory And the parts haven't been switched.
Best thing to do would be send colt and email with your serial number and see if they will look it up to make sure the gun is factory And the parts haven't been switched.
Great advice. I think I'll do that.
Thanks guys. I took a look at the lower. Has full sized S marked hammer and trigger. Hammer had notch in the face/top. H buffer. Lower also has LE.... serial number and the square QR type code on it. I looked on S. Armament and Brownells. The ambi is exactly as shown "Colt Ambi" with allen head. And is S marked. Weird
This is just a guess:
Maybe they were short on 4 POS extensions & standard selectors thus they installed what was available! Unless the receiver extension looks like it was replaced outside of Colt (check for the square stakings), you should consider yourself lucky with the extras.
That's a shame, I've had good luck with Arms Unlimited. <snip>
Yeah, I was/am pretty miffed. Only thing I can do is vote with my wallet, as they say - had about $500 worth of items in my cart for a later purchase but bought it all elsewhere. I had heard complaints about them before, ie shipping/stock issues and some big suppressor snafu a while back, but gave them a chance. Should have listened...
I also see they are selling Expanse uppers now, properly advertised as Expanse - so apparently the are breaking up Expanse rifle and selling separately at an upcharge over the whole rifle price :angry:
EDIT - I actually called them yesterday - I knew there was no way I could return/refund due to changes I made, so I went at it from a "these are listed incorrectly, you should review the listing..." angle, not angling for a refund or anything, and they basically don't care. They said we don't know what's in the box, we just get it from colt and sell it - no lie, she actually said that. I mentioned something about part numbers and item descriptions, etc but I think it was lost on her. Anyway she finally said she would let the web folks know which I think was more just to get me off the phone than anything lol. They were so non-plus about the whole thing so I left a neg review for the item making sure everyone knows it an Expanse, but it hasn't posted yet.
EDIT Sorry OP got Off-Topic - let us know what Colt says about the serial confirmation.
This is just a guess:
Maybe they were short on 4 POS extensions & standard selectors thus they installed what was available! Unless the receiver extension looks like it was replaced outside of Colt (check for the square stakings), you should consider yourself lucky with the extras.
So I called Colt who ran the serial #. They confirmed it left factory as OEM 1. They also confirmed exactly what was mentioned above, they were short on standard selectors and four position receiver extensions. So, they installed the factory ambi safety and 6 position receiver extension. Too easy...
Pretty cool. Im happy.
So I called Colt who ran the serial #. They confirmed it left factory as OEM 1. They also confirmed exactly what was mentioned above, they were short on standard selectors and four position receiver extensions. So, they installed the factory ambi safety and 6 position receiver extension. Too easy...
Pretty cool. Im happy.
That happens from time-to-time, you lucked out. Happened to me recently with LMT - purchased an MWSE (chrome-lined base model) and it arrived with a stainless match 5R barrel. Called LMT about it and they were running short on CL's, so they put a 5R in it instead.
Yeah, I was/am pretty miffed. I had heard complaints about them before, ie shipping/stock issues and some
big suppressor snafu a while back, but gave them a chance. Should have listened...
Same here with Arms Unlimited and their shipping.
I ordered a M300C Scout on May 31 and received a "Shipped" e-mail & Tracking#
Didn't actually ship until June 3rd
Sorry for getting off topic OP
On topic, I notices the Expanse parting out "sale"
So I called Colt who ran the serial #. They confirmed it left factory as OEM 1. They also confirmed exactly what was mentioned above, they were short on standard selectors and four position receiver extensions. So, they installed the factory ambi safety and 6 position receiver extension. Too easy...
Pretty cool. Im happy.
Good deal. 👍 Glad someone didn't pull the "switcheroo" and switch out LPK
That happens from time-to-time, you lucked out. Happened to me recently with LMT - purchased an MWSE (chrome-lined base model) and it arrived with a stainless match 5R barrel. Called LMT about it and they were running short on CL's, so they put a 5R in it instead.
You lucky dog.... Get it.... Your Avatar.
You lucky dog.... Get it.... Your Avatar.
Squirrel!
This guy (https://www.m4carbine.net/showthread.php?86399-Colt&p=2323737#post2323737) also found an OEM Colt with the 6 position RE.
I checked that out, thank you. Posted there too
I have 4 six position REs from Specialized Armament. The one on the right is listed as Colt Part number SP69072 on Specialized Armament's website. The one on the left is a standard four position Colt RE. Except for the different holes, they do look a lot alike. They are also listed on Gunbroker by scottryan. I have no idea for sure what the deal is but those are both very reputable sources for Colt parts.
http://www.gunbroker.com/Item/563437520
http://i212.photobucket.com/albums/cc115/sheepsushi/IMG_1451.jpg
Some Colt 6920s in the upper 400000 serial number range have been coming with the six position MK18 tubes.
I know of a guy that is local that has one and the tube is still factory staked.
Makes sense. Mine is in the top upper 4000000
Ordered an OEM 1 complete lower off gbroker. (Excluding the trigger guard and stock) Supposedly was a take off. It came with an S marked ambi safety and a six position reciever extension.
The RE and castle nut are staked like my other colts.
Does this sound right? An ambi and 6 position on a 6920 oem?
Thanks
We just received 30 in. They all have 4 position RE and none ambi selector.
C4
Some Colt 6920s in the upper 400000 serial number range have been coming with the six position MK18 tubes.
I know of a guy that is local that has one and the tube is still factory staked.
Apparently, the R0977 comes with a 6 position RE. Other than that, no 6920 is supposed to come with that RE.
C4
After speaking with Colt and verifying the OEM and parts substitution, I fell lucky that I didnt get a standard OEM
Beat Trash
06-09-16, 10:42
I'd be happy that you got the 6 position RE. I would like to see Colt switch to using 6 position RE in all of their guns personally.
The colt 6920 socom came with an ambi saftey for sure and 6 position i think , my 6920 had a 4 position tube
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Some Colt 6920s in the upper 400000 serial number range have been coming with the six position MK18 tubes.
I know of a guy that is local that has one and the tube is still factory staked.
What is a "Mk 18" tube?
What is a "Mk 18" tube?
The six position receiver extension that is being talked about in this thread.
The six position receiver extension that is being talked about in this thread.
Sorry, I understand that. I'm trying to understand why he referred to it as a "Mk 18" tube.
yeah, Id also like it if Colt started shipping their 6920's with the mk18, 6 position tube. Its funny how the mk18 has the 6 position RE and the M4 has the 4 position RE. Due to the shorter barrel, the mk18 has virtually no need for the 6 position RE (run the stock out on shorter barreled guns and run the stock in on longer barreled guns etc), but i run all of my 14.5/16" setups with the stock one click out on the RE. Its not really a big deal, but i hate ripping receiver extensions off of the beautifully staked colt lowers just to put on a RE with a few more holes in it.
yeah, Id also like it if Colt started shipping their 6920's with the mk18, 6 position tube. Its funny how the mk18 has the 6 position RE and the M4 has the 4 position RE. Due to the shorter barrel, the mk18 has virtually no need for the 6 position RE (run the stock out on shorter barreled guns and run the stock in on longer barreled guns etc), but i run all of my 14.5/16" setups with the stock one click out on the RE. Its not really a big deal, but i hate ripping receiver extensions off of the beautifully staked colt lowers just to put on a RE with a few more holes in it.
I'm still trying to figure out where in the world you guys are coming up with calling this a "Mk 18" receiver extension other than that's what specialized armament calls them. The military CQBR is an accessory upper receiver for fielded M4A1s which obviously have a 4 position. Any complete Mk 18 builds we've all understood to also be 4 position tubes. Mk 18s are built by NSWC Crane, not Colt.
But that said, it's not funny at all and makes complete sense. The whole purpose of the Mk 18 / CQBR is to provide a rifle length caliber weapon that's short enough for close quarter battle with limited maneuverability and space. Think VBSS on ships, clearing rooms, etc… In this scenario, having an extra 2 adjustment points on your carbine to make it even shorter makes complete sense. I know a lot of guys will even have to run their stock completely collapsed in certain situations and this can be especially relevant under NODs with using the laser as your aiming device rather than your day optic.
Livefreeordie92
06-11-16, 01:26
I've never seen or heard of a colt with a 6 position receiver extension. To be honest, I had no idea they even made one. I have seen Colts with ambi selectors however, namely a 6920 Socom and an AR15A4.
If I can grab one of these for $750 or less somewhere, let me know!
yeah, Id also like it if Colt started shipping their 6920's with the mk18, 6 position tube. Its funny how the mk18 has the 6 position RE and the M4 has the 4 position RE. Due to the shorter barrel, the mk18 has virtually no need for the 6 position RE (run the stock out on shorter barreled guns and run the stock in on longer barreled guns etc), but i run all of my 14.5/16" setups with the stock one click out on the RE. Its not really a big deal, but i hate ripping receiver extensions off of the beautifully staked colt lowers just to put on a RE with a few more holes in it.
That's merely personal preference.
I'm still trying to figure out where in the world you guys are coming up with calling this a "Mk 18" receiver extension other than that's what specialized armament calls them. The military CQBR is an accessory upper receiver for fielded M4A1s which obviously have a 4 position. Any complete Mk 18 builds we've all understood to also be 4 position tubes. Mk 18s are built by NSWC Crane, not Colt.
But that said, it's not funny at all and makes complete sense. The whole purpose of the Mk 18 / CQBR is to provide a rifle length caliber weapon that's short enough for close quarter battle with limited maneuverability and space. Think VBSS on ships, clearing rooms, etc… In this scenario, having an extra 2 adjustment points on your carbine to make it even shorter makes complete sense. I know a lot of guys will even have to run their stock completely collapsed in certain situations and this can be especially relevant under NODs with using the laser as your aiming device rather than your day optic.
How does having extra adjustment points make it shorter? Fully collapsed on a 4 position tube = fully collapsed on a 6 position tube.
Apologies if I misunderstood your post.
If I can grab one of these for $750 or less somewhere, let me know!
Grant maybe?
Alnamvet68
06-12-16, 06:02
I'm still trying to figure out where in the world you guys are coming up with calling this a "Mk 18" receiver extension other than that's what specialized armament calls them. The military CQBR is an accessory upper receiver for fielded M4A1s which obviously have a 4 position. Any complete Mk 18 builds we've all understood to also be 4 position tubes. Mk 18s are built by NSWC Crane, not Colt.
But that said, it's not funny at all and makes complete sense. The whole purpose of the Mk 18 / CQBR is to provide a rifle length caliber weapon that's short enough for close quarter battle with limited maneuverability and space. Think VBSS on ships, clearing rooms, etc… In this scenario, having an extra 2 adjustment points on your carbine to make it even shorter makes complete sense. I know a lot of guys will even have to run their stock completely collapsed in certain situations and this can be especially relevant under NODs with using the laser as your aiming device rather than your day optic.
I'm a bit confused...having extra holes would allow it to extend further, not shorter.
Neither. The first and last holes are in the same place on both extensions with more or less holes between.
The 4/6 RE are the same length I think? One wouldn't be longer or shorter. Correct?
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The 4/6 RE are the same length I think? One wouldn't be longer or shorter. Correct?
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the difference is the location of the recesses for the bolt to fit in.
https://farm8.staticflickr.com/7616/16558930160_488eab8867.jpg
vs
https://4b1e874935ea5d25a97e-f099844d0e354c7ab50c55a966be6870.ssl.cf2.rackcdn.com/product/XBCMMILSPECRE.jpg
the difference is the location of the recesses for the bolt to fit in.
https://farm8.staticflickr.com/7616/16558930160_488eab8867.jpg
vs
https://4b1e874935ea5d25a97e-f099844d0e354c7ab50c55a966be6870.ssl.cf2.rackcdn.com/product/XBCMMILSPECRE.jpg
Right. So, same OAL.
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Apparently, the R0977 comes with a 6 position RE. Other than that, no 6920 is supposed to come with that RE.
C4
But some have been. I don't think it is suppose to come with way but I guess they used some 6 position extensions for some reason.
If I can grab one of these for $750 or less somewhere, let me know!
In stock.
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=LE6920-OEM1
C4
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But some have been. I don't think it is suppose to come with way but I guess they used some 6 position extensions for some reason.
Yes, but apparently ONLY from one dealer. Odd. They might have been a special order.
C4
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Yes, but apparently ONLY from one dealer. Odd. They might have been a special order.
C4
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What dealer? When I called Colt, they said the ran out of the 4 position and standard selectors so they installed the ambi and 6 position. Seams like like standard practice if they run short on standard parts.
How does having extra adjustment points make it shorter? Fully collapsed on a 4 position tube = fully collapsed on a 6 position tube.
Apologies if I misunderstood your post.
I'm a bit confused...having extra holes would allow it to extend further, not shorter.
Haha, yes, apparently everyone misunderstood my post - which probably means I worded it terribly lol.
By shorter I meant that you can run the stock shorter than you would with a 4 position. I.e., the gap between fully collapsed and the first position on a 4 position is quite large. With the 6 position, there's a few adjustment points in there closer in that still give you some length over fully collapsed but not quite as long as the first position on a 4-position tube.
I run my current cqbr this way (With a mil surplus CAR stock), I have an LMT 6 position on it and often run it at the 2nd position which is closer in than the first position on the standard M4 tube.
Hopefully explaining that correctly…
In stock.
http://www.gandrtactical.com/cgi-bin/commerce.cgi?preadd=action&key=LE6920-OEM1
C4
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Since I can't find a Colt 10.3 barrel anywhere, I'm tempted to pick up an OEM and send the barrel to ADCO for chopping/rethreading. Bonus, extra Colt Lower :). Too bad they don't come with the Colt Ambi Selector, can't find one of those either.
What is the gas port size on the OEM's, anyone know? SOCOM-RC would ride on it pretty much all the time.
Colt LE6930 Socom "M4A1" Rollmark come with a TROY Industries quadrail, semi auto ambi safety, heavy barrel and a four postion reciever extension "stock tube"
Colt LE6930 Socom "M4A1" Rollmark come with a TROY Industries quadrail, semi auto ambi safety, heavy barrel and a four postion reciever extension "stock tube"
It's getting hard to find those rifles, I looked. I really liked the M4A1 roll mark.
Apparently it works both ways :(
I bought one labeled "COLT M4 CARBINE Ambi Safety" that didn't come with an ambi safety
Same for me. Box marked with ambi-safety but actual arm didn't come with it.
Mine came in a box marked ambi safety and with a manual specific to models with the monolithic uppers. Oh well. It's just Colt being Colt.
outdoorsportsman
08-12-20, 09:21
On the subject of Colt Receiver Extensions, what is the best method to remove a factory installed Colt RE? I would like to change out the factory 4 position for a 6 position but in the past have damaged the Colt 4 position during the removal. I've used a magwell block with a Brownells RE wrench (very sturdy/well designed wrench). Hitting the wrench with a deadblow hammer. This method has never broken the factory Colt staking and instead the whole receiver extension and endplate turn out of the lower. Luckily it's only damaged the RE and not the lower. Is a better method to clamp the RE in the vice? I know some of you guys (Grant) has done this many times with no damage to any parts. Any advice is appreciated.
On the subject of Colt Receiver Extensions, what is the best method to remove a factory installed Colt RE? I would like to change out the factory 4 position for a 6 position but in the past have damaged the Colt 4 position during the removal. I've used a magwell block with a Brownells RE wrench (very sturdy/well designed wrench). Hitting the wrench with a deadblow hammer. This method has never broken the factory Colt staking and instead the whole receiver extension and endplate turn out of the lower. Luckily it's only damaged the RE and not the lower. Is a better method to clamp the RE in the vice? I know some of you guys (Grant) has done this many times with no damage to any parts. Any advice is appreciated.
Just turn the wrench and stop using a hammer. Get leverage if you need to, though you shouldn't need much. The staking is undone pretty easy.
Is it possible someone reclassified their "Expanse" lower as an "OEM" lower?
No ambi safety on any Expanse I have ever seen or any that I own.
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