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[ARCHIVED THREAD] - Colt Keyhole Uppers

Posted: 4/5/2015 9:47:23 PM EDT

Does anyone know when Colt started using the Cerro forged uppers? I think they went from Alcoa to Diemaco to Keyhole. Can anyone confirm and provide timelines?

ETA: specifically, M4 flat top uppers.

Thanks

Posted: 4/7/2015 2:30:02 AM EDT

[#1]

I dont know but

My 2000 era Colt came with the Alcoa receiver.
My friend' 2004 era came with a Diemaco receiver.
My 2008 era came with a Cerro receiver

Posted: 4/7/2015 11:12:45 PM EDT

[#2]

Quote History

Quoted:
I dont know but

My 2000 era Colt came with the Alcoa receiver.
My friend' 2004 era came with a Diemaco receiver.
My 2008 era came with a Cerro receiver

View Quote

what forge mark on the Diemaco receiver?

Posted: 4/8/2015 12:04:32 AM EDT

[#3]

My old BN had NIB M4's that were dated ~'05 and most were Cardinal forge, the rest were mixed AF, Keyhole and Anchor Harvey Diemaco's.

William

Edit: Forgot that done Anchor Harvey Colts (A C) were in there as well.

Edit again: Also as far as I've been able to tell, Colt started with the stamped "C" receivers circa 2008, all of the M4's that were dated early '09 were stamped, and have been ever since. If anyone else can narrow down this date let me know please.

[ARCHIVED THREAD] - Colt Keyhole Uppers

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[ARCHIVED THREAD] - Colt Keyhole Uppers

[ARCHIVED THREAD] - Colt Keyhole Uppers