Colt Pin and Weld

Bret

Joined: Sep 2002

Posts: 1139

EE: 100% (5)

USA

Posted: 11/10/2025 8:38:26 PM EDT

I bought some LE6121 upper halves a couple of years ago when they were cheap. I'd like to build up a couple of non-SBR rifles using these uppers. In order to get the barrel length to 16", I'd like to have them pinned and welded to match how Colt does it. Below is a picture from a SOCOM that I found on this website. Does anyone sell the flash hider that Colt uses for their pin and welds? Who would be able to do an excellent job duplicating the Colt pin and weld?

TGWLDR

GUN WHORE

Joined: Dec 2014

Posts: 53564

EE: 100% (463)

IA, USA

Posted: 11/10/2025 10:29:03 PM EDT

[#1]

Outside of the secondary market/take offs, I've yet to see those extended FHs for sale.

As far as the quality of the P/W, Retro Arms Works or ADCO would be 2 to contact.

"All welchers should be removed from the EE".-Aimless

mlin

Joined: May 2008

Posts: 1482

EE: 100% (23)

CA, USA

Posted: 11/11/2025 2:34:18 AM EDT

[#2]

ADCO sell a spacer and combined with regular A2 flash hider P&W, it is long enough to be 16.1".
https://adcofirearms.com/shop/manufacturer/adco/kac-spacer/

I believe John @ Retro Arms Works also sell similar spacer with A2 to achieve the same result.

FONTY

Member

Joined: Feb 2010

Posts: 2296

EE: 100% (94)

FL, USA

Posted: 11/11/2025 11:19:09 PM EDT

[#3]

The only place i know that leaves the weld showing similar to Colt is D.wilson Manufacturing but I've never seen the Colt extended A2 for sale anywhere.

Attached File

azcheesehead

Joined: Nov 2016

Posts: 817

EE: 100% (11)

AZ, USA

Posted: 11/13/2025 9:23:04 AM EDT

[#4]

ADCO would be the first place I would talk to about it.

mlin

Joined: May 2008

Posts: 1486

EE: 100% (23)

CA, USA

Posted: 11/13/2025 5:58:43 PM EDT

[#5]

Quote History

Originally Posted By FONTY:
The only place i know that leaves the weld showing similar to Colt is D.wilson Manufacturing but I've never seen the Colt extended A2 for sale anywhere.

https://www.ar15.com/media/mediaFiles/236598/pin_and_weld_jpg-3657613.JPG

View Quote

If you ask ADCO or John Thomas not to refinish the welding spot, they will do so.

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Colt Pin and Weld