Mostly Colt uppers thru the ages...

[Shepherdtrainer]

To my knowledge Colt Canada/Diemaco only ever shipped them to LE agencies, circa 2005, in 4 configurations. Clyde has the 11.5 with the Surefire M73 rail in stock if you are looking for one of those. Otherwise you could find a used military surplus stripped upper receiver, I believe Diemaco was a gov contractor for replacement parts.

https://clydearmory.com/agency-trade-in-diemaco-ro933-commando-11-5-upper/

 

[Spas-12 Owner]

To my knowledge Colt Canada/Diemaco only ever shipped them to LE agencies, circa 2005, in 4 configurations. Clyde has the 11.5 with the Surefire M73 rail in stock if you are looking for one of those. Otherwise you could find a used military surplus stripped upper receiver, I believe Diemaco was a gov contractor for replacement parts.

https://clydearmory.com/agency-trade-in-diemaco-ro933-commando-11-5-upper/

They are about $150 stripped and well used. Clyde's is reaching @ $1000 even complete.

 

[Spas-12 Owner]

 

[CQB27]

List of AR forge codes.

A (splintered) = Anchor Harvey Aluminum

AF = Alcoa Forge

C AF = Colt Alco Forge

C MB = Colt / Mueller Brass

Cardinal (stylized) = Cardinal Forge

CH = Colt Harvey Aluminum

Circle/Crosshairs w/"AR" = ArmaLite

CK = Colt / Kaiser Aluminum

CM = Colt / Martin Marietta

D (stylized) = Diemaco

DK = Diemaco / Kaiser Aluminum

E = Emco

EK = EMCO/Kaiser

E MB = EMCO/Mueller Brass

F keyhole = FNMI / Cerro Forge

FA = FNMI / Anchor Harvey

FK = FNMI / Kaiser Aluminum

FM = FN/Martin Marietta

FMB = FNMI / Mueller Brass

Keyhole = Cerro Forge

L = Lewis Machine & Tool

LK = LAR / Kaiser Aluminum

LM = LAR / Martin Marietta

M (under diamond) = Mueller Industries

PA = Capco / Anchor Harvey

PM = Capco / Martin Marietta

 

[CQB27]

To my knowledge Colt Canada/Diemaco only ever shipped them to LE agencies, circa 2005, in 4 configurations. Clyde has the 11.5 with the Surefire M73 rail in stock if you are looking for one of those. Otherwise you could find a used military surplus stripped upper receiver, I believe Diemaco was a gov contractor for replacement parts.

https://clydearmory.com/agency-trade-in-diemaco-ro933-commando-11-5-upper/

My agency bought numerous Colt M4LE “Double Bullet” carbines in 2005 that came through Andrew’s store in Bogart.

Almost all of them were 100% Hartford builds, but 3 or 4 of them had Hartford M4LE lowers with Colt Canada Diemaco uppers. Both the uppers and BCGs were “Stylized D” marked. I don’t remember what the barrel markings were.

Here is a pic of one of the bolt carries with a deep “Stylized D” stamp.

 

[Shepherdtrainer]

Those uppers should have CHF barrels. They are marked “CC” or C but the style is different than the US rollmarks.

 

[CQB27]

Those uppers should have CHF barrels. They are marked “CC” or C but the style is different than the US rollmarks.

I’m sure they were marked that way, I just don’t remember. They were 100% Diemaco uppers according to the Colt rep. I spoke with him personally about it because I was so intrigued by them. He stated from time to time Colt Hartford would use Colt Diemaco parts when needed.

If they were still around I would look. They were replaced years ago because they were shot out to the point they were about 6 MOA barrels and had some significant erosion starting at the barrel leade and extending about an inch toward the muzzle.