My if Colt still made a A2 Carbine build - Page 1

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[ARCHIVED THREAD] - My if Colt still made a A2 Carbine build

Posted: 7/18/2016 12:38:38 PM EDT

Just bought a complete new take off Colt LE6920 lower and a new striped Colt A2 upper receiver. I also bought a new Colt parts to complete the upper including a 14.5" SOCOM barrel. So this would be what you would get if they made a A2 Carbine. Im going to try a jam nut with standard A2 FH. 6920 with 14.5" barrel and A2 upper
pics when it's built.

Posted: 7/18/2016 12:51:18 PM EDT

[#1]

So sort of a 727?

Posted: 7/18/2016 1:01:58 PM EDT

[#2]

You would need to SBR the lower, FWIW. Unless I'm not understanding what a "jam nut" is. But you didn't mention an extended A2, so.......

Posted: 7/18/2016 1:51:46 PM EDT

[#3]

Quote History

Quoted:
You would need to SBR the lower, FWIW. Unless I'm not understanding what a "jam nut" is. But you didn't mention an extended A2, so.......

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Jam nut acts as a spacer so that you can pin and weld an A2 FH instead of using just an extended A2 FH to make it non-NFA. I did this with one of my 723s. I have since bought two spacers from ADCO. One day, I will have the jam nut replaced with the spacer.

Posted: 7/18/2016 2:00:10 PM EDT

[#4]

ya the jam nut looks just like the flats part of the A2 FH. Ill try it out and see if i like it. if not ill pin the ext A2. Ill have to drill the standard A2 for the pin.

Posted: 7/21/2016 12:10:49 PM EDT

[#5]

This is what Im also thinking of doing with my FN A2 upper. Put a Colt or BCM 14.5" socom barrel on it. What about sight base? Are there any non F marked sight bases floating around?

Posted: 7/21/2016 12:51:31 PM EDT

[#6]

i bought a Colt SOCOM barrel that already has the sight on it. from what I read its a pain to put another sight base on a barrel that already had one installed.

Posted: 7/21/2016 1:17:13 PM EDT

[#7]

this is a non f marked .750 base http://www.fulton-armory.com/frontsightbaseforgedwbayolug.aspx

Posted: 7/21/2016 1:48:09 PM EDT

[#8]

Quote History

Quoted:
This is what Im also thinking of doing with my FN A2 upper. Put a Colt or BCM 14.5" socom barrel on it. What about sight base? Are there any non F marked sight bases floating around?

View Quote

You can use the F marked FSB with an A2 upper, it's taller than the standard height FSB. So you have to crank the FS post further down to compensate for the taller FSB or get a shorter post. Most members in this forum will tell you they have no problems sighting in using the A2 upper and F marked FSB combination.

Posted: 7/21/2016 1:53:18 PM EDT

[#9]

when i did mt A1 upper on a Colt M4 barrel i had to shorten the front sight post.

Posted: 7/23/2016 5:57:29 AM EDT

[#10]

added up the cost $1455

but its all new Colt

Posted: 7/23/2016 4:09:27 PM EDT

[#11]

I've been kicking around the same idea of an A2 carbine and sbr. I think this thread need build progress pics!

Posted: 7/23/2016 4:18:08 PM EDT

[#12]

iv only received a few small items so far. the lower comes tuesday, the upper receiver is still on backorder. a lot of parts come monday. There is 1 exactly like im building on EE right now

Posted: 7/29/2016 2:33:54 AM EDT

[#13]

ill have to take some pics of what I have. beware on GB I received a expanse lower so had to gut it

. some stuff still on order.

Posted: 7/29/2016 9:36:11 AM EDT

[#14]

Quote History

Quoted:
ill have to take some pics of what I have. beware on GB I received a expanse lower so had to gut it

. some stuff still on order.

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Why did you have to gut it?

Posted: 7/29/2016 11:09:28 AM EDT

[#15]

the cheap commercial parts they put in it. the hammer was a bare metal speed hammer, the trigger was poorly coated black with a epoxy, the safety was the old style but i had a new style Colt. I just bought a new take out Colt trigger assembly for $56.

Posted: 7/29/2016 12:30:24 PM EDT

[#16]

Now I find out the new Colt upper receiver won't be here till mid Sept.

Posted: 8/15/2016 11:01:45 PM EDT

[#17]

called Colt today. they still make the A2 uppers but only in small batches. no eta

Posted: 8/15/2016 11:41:10 PM EDT

[#18]

Quote History

Quoted:

You can use the F marked FSB with an A2 upper, it's taller than the standard height FSB. So you have to crank the FS post further down to compensate for the taller FSB or get a shorter post. Most members in this forum will tell you they have no problems sighting in using the A2 upper and F marked FSB combination.

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Quote History

Quoted:

Quoted:
This is what Im also thinking of doing with my FN A2 upper. Put a Colt or BCM 14.5" socom barrel on it. What about sight base? Are there any non F marked sight bases floating around?

You can use the F marked FSB with an A2 upper, it's taller than the standard height FSB. So you have to crank the FS post further down to compensate for the taller FSB or get a shorter post. Most members in this forum will tell you they have no problems sighting in using the A2 upper and F marked FSB combination.

Damn it man.... the actual total heightt is the same for both F marked and non-F marked FSBs. The height of the sight post is the same as well. The "shoulder" below the sight post (flat between ears) is .040" taller on the F marked FSB than non. TRIVIAL If you need a shorter sight post, you have bigger issues than the .040" shoulder height difference between F and non-F marked FSBs.

Use whatever you can get your hands on and run with it.

Posted: 8/15/2016 11:43:45 PM EDT

[#19]

I would think an A2 carbine would look like this (but with USGI furniture). Longer sight radius than a carbine gas and can still use a bayonet. The shorter barrel and capable stock make it a carbine but it maintains the A2 rifle lineage with the longer sight radius. It's a mutant between the A2 and CAR15.

Posted: 8/15/2016 11:53:17 PM EDT

[#20]

what im building is a XM4. they only made them for 2 years befor they adopted the flat top.
i may have just ground down the front sight because it had to be screwed down so much. I dont remember.

Posted: 8/16/2016 12:01:00 AM EDT

[#21]

Quote History

Quoted:

You can use the F marked FSB with an A2 upper, it's taller than the standard height FSB. So you have to crank the FS post further down to compensate for the taller FSB or get a shorter post. Most members in this forum will tell you they have no problems sighting in using the A2 upper and F marked FSB combination.

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Quote History

Quoted:

Quoted:
This is what Im also thinking of doing with my FN A2 upper. Put a Colt or BCM 14.5" socom barrel on it. What about sight base? Are there any non F marked sight bases floating around?

You can use the F marked FSB with an A2 upper, it's taller than the standard height FSB. So you have to crank the FS post further down to compensate for the taller FSB or get a shorter post. Most members in this forum will tell you they have no problems sighting in using the A2 upper and F marked FSB combination.

This is one of those debates that makes me Forest Whitaker eye. The height difference is 4 hundredths. It's one of those things that people urhh mah gawd milspec about that doesn't matter.

Posted: 8/16/2016 12:08:22 AM EDT

[#22]

Colt did make it, it was the XM4.

Posted: 8/16/2016 12:10:20 AM EDT

[#23]

Quote History

Quoted:

what im building is a XM4. they only made them for 2 years befor they adopted the flat top.

i may have just ground down the front sight because it had to be screwed down so much. I dont remember.

View Quote

I see I'm late to the party on that one.

Posted: 8/16/2016 12:22:32 AM EDT

[#24]

i read about the barrel being a different profile. 1st time iv seen it.

Posted: 8/21/2016 2:46:03 PM EDT

[#25]

i bought a unfired take off A2 upper C AF on EE that will save me $175

Posted: 8/21/2016 8:51:02 PM EDT

[#26]

im thinking i shouldnt bother with M4 feed ramps. the barrel has them but not the upper.

Posted: 8/21/2016 9:03:25 PM EDT

[#27]

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Quoted:
im thinking i shouldnt bother with M4 feed ramps. the barrel has them but not the upper.

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I know plenty of folks here will chime in here shortly. So I won't be the last to say that you really don't need the cuts in the upper receiver unless you're running full-auto.

Posted: 8/21/2016 11:51:37 PM EDT

[#28]

Quote History

Quoted:
i bought a unfired take off A2 upper C AF on EE that will save me $175
<a href="http://s419.photobucket.com/user/ford7379trucks/media/20160818_201431_zpsel9g7rzt.jpg.html" target="_blank">http://i419.photobucket.com/albums/pp280/ford7379trucks/20160818_201431_zpsel9g7rzt.jpg</a>

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Nice, that will do the job. the finish will be a better match for modern Colt and other receivers as well. Your 80s/early 1990s A2 receivers were XM grey, and finding a lower that matches nicely takes a bit more legwork than picking up the "flavor of the week" lower at your local gun shop.

As already mentioned, don't sweat the lack of M4 feed ramps on the receiver.

Posted: 8/22/2016 12:09:54 AM EDT

[#29]

cant wait to put this together tomorrow. range tuesday. pics tomorrow

Posted: 8/22/2016 10:16:13 PM EDT

[#30]

Quote History

Quoted:
So sort of a 727?

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Quoted:
So sort of a 727?

Quoted:
Colt did make it, it was the XM4.

Did Colt ever put a SOCOM profile barrel with an A2 upper?

Posted: 8/22/2016 11:44:52 PM EDT

[#31]

No.

Posted: 8/23/2016 1:31:32 AM EDT

[#32]

got my A2 upper from nchapa today and it was exactly what i was looking for. sold as a new take off. Looks like its never had a bolt in it. still has the heavy red oil colt puts on them on the sights. got it all together and should be taking it out to the range tomorrow

Posted: 8/23/2016 6:36:39 PM EDT

[#33]

She turned out nice OP

You just need an N1 fiberlite stock and you have an as new Colt RO727 carbine. BTW, I could help but notice the hydraulic press as well as the oxygen and acetylene set you you have there in your garage/shop. That's pretty heavy duty stuff

Posted: 8/23/2016 10:31:19 PM EDT

[#34]

got to dark to take pics. she shot great though. windage was dead on in the center. about 7" low @25meters. only got 20 rounds befor it was too dark. didnt get to the range until 7:30pm Then one of the new members showed up with a new heavy duty bench with wheels on the front so it can be easily moved. I helped him unload it then talked about guns for a wile. Also had to resight in my Acog on my 6920 because i flipped the mount back around.

Posted: 8/24/2016 9:21:11 AM EDT

[#35]

JCunningham, you have a Pur-ty XM4 there.

PLEASE get that M4 Stock off of it and get a REAL N1 Stock on it, and then your XM4 will be MAGNIFICENT !!!

Posted: 8/24/2016 1:07:53 PM EDT

[#36]

ya looking for a NOS Colt N1 stock

Posted: 8/24/2016 1:57:22 PM EDT

[#37]

She's a beauty!!!

Posted: 8/24/2016 4:39:17 PM EDT

[#38]

Really sharp.
N1 stock, "Doooooo it."
I finally pulled the trigger on a N1 stock set for my 723 clone.
Scored a Aimpoint 5000XD in the box today for my 727 clone.
Just need to add one of my Lone Star grips to the 723 tonight.
A2 flash hider and jam nut swap is next for both.

The kids;