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Posted: 4/10/2011 5:37:58 PM EDT
I have been around and building AR's for quite some time now. I've built and currently own 16 different variations of the AR.

I don't post a lot but I have been really watching the retro forum here lately and have decided I want to build as accurate as possible replica of the XM177 carbine. I have searched and found many of the answers I needed but I have a few other questions that maybe someone could answer or link me to the info.

What is the correct upper and lower receivers to use?

Is a 10" barrel with a 4.5" Moderator correct?

Who is a good source for the correct parts?

Thanks in advance for any help.
Link Posted: 4/10/2011 5:41:54 PM EDT
[Last Edit: 4/10/2011 5:50:07 PM EDT by m1sniper]
If you want to be 110% anally correct,you want a round forge upper with rebated (counterbored) front lug,no forge code,then a full fence lower..This is for the XM177E2.
Member Brick makes the best non NFA moderator and grenade ring,,,an a lot of us used the bushy lightweight barrel.The cut pin and weld work done by Heatnbeat,Adco,and in past 45bravo.I think he may be on a sabatical for now tho.
The XM177E2 uses the 11.5 barrel + moderator.This ends up less then 16 inches,so you will need to SBR it.If you don't want the hassle of the SBR all above can make it 16in legal,and the difference between the original and 16 in is like 3/8ths in IIRC.
Link Posted: 4/10/2011 5:55:13 PM EDT
Originally Posted By m1sniper:
If you want to be 110% anally correct,you want a round forge upper with rebated (counterbored) front lug,no forge code,then a full fence lower..This is for the XM177E2.
Member Brick makes the best non NFA moderator and grenade ring,,,an a lot of us used the bushy lightweight barrel.The cut pin and weld work done by Heatnbeat,Adco,and in past 45bravo.I think he may be on a sabatical for now tho.
The XM177E2 uses the 11.5 barrel + moderator.This ends up less then 16 inches,so you will need to SBR it.If you don't want the hassle of the SBR all above can make it 16in legal,and the difference between the original and 16 in is like 3/8ths in IIRC.


I appreciate the help. I plan an SBR'ing the rifle.

I know very little about Colt upper/lower receivers. Is there a certain series/part numbers I need to be searching for?
Link Posted: 4/10/2011 6:52:00 PM EDT
If you're going to SBR it anyway I would build an E1
Link Posted: 4/10/2011 7:46:18 PM EDT
www.retroblackrifle.com

This should help..
Link Posted: 4/10/2011 9:05:45 PM EDT
You might want to pick this up: NFA moderator.

Link Posted: 4/11/2011 10:17:58 AM EDT
Thanks for the links and info. Now to just find the right lower so I can get started.
Link Posted: 4/11/2011 10:25:43 AM EDT
Originally Posted By RCC1:
Thanks for the links and info. Now to just find the right lower so I can get started.

A NoDak Spud model NDS-16A1 is correct if you're going to do an E2.
Link Posted: 4/11/2011 1:30:00 PM EDT
That is a really nice looking moderator. I'd like to put on that on my xm177 build. I got my 604 upper receiver from that seller. It was a beauty, bet this is too.

Originally Posted By OlGunner:
You might want to pick this up: NFA moderator.



Link Posted: 4/28/2011 4:46:13 PM EDT
Still working on getting my parts together. I want to use a Colt lower receiver for this build. What make/model do I need to locate?
Link Posted: 4/28/2011 4:54:10 PM EDT
Colt lowers are all full auto NFA item,unless you use an SP1 lower.But those are slab sides and have a large hole for the pivot pin.
Link Posted: 4/28/2011 4:59:00 PM EDT
Originally Posted By m1sniper:
Colt lowers are all full auto NFA item,unless you use an SP1 lower.But those are slab sides and have a large hole for the pivot pin.

If he just wants to use Colt, he can always use a modern Colt A2 type lower receiver. Of course, it wouldn't be correct for his rifle.
Link Posted: 4/29/2011 7:18:18 AM EDT
Who makes a slip-over moderator for a 16" barrel?
Link Posted: 4/29/2011 8:10:59 AM EDT
Bushmaster and DPMS have both had slip-overs for 16". I have the DPMS one for an HBAR, it's not very accurate looking.
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