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Posted: 9/12/2025 9:06:32 AM EDT
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Hi, I found these markings on a Colt M4. Could you help me determine if it is authentic? Thank you !       
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Colt is not the only manufacturer to mark "M4" above the gas tube hole. But they do stamp them as such the majority of the time. What, if any, other markings/features does it bear? ( Forge markings/CAGE markings/ stampings/T-markings/dry lubed interior ?) |
"All welchers should be removed from the EE".-Aimless
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That's definitely an authentic Colt upper, only part not sure of is the bolt. I have a 6921 upper from the same time frame with raised C and barrel date 09/04 Attached File Attached File |
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Originally Posted By FONTY: That's definitely an authentic Colt upper, only part not sure of is the bolt. I have a 6921 upper from the same time frame with raised C and barrel date 09/04 https://www.ar15.com/media/mediaFiles/236598/IMG_0510_jpg-3623106.JPG https://www.ar15.com/media/mediaFiles/236598/IMG_0512_PNG-3623108.JPG Yeah,like FONTY said. ^^^^^ (For some reason I only saw your first Pic, OP.)  Edit: Bolt is USGI. Mag particle tested / proof tested / National Aerospace is the manufacturer. |
"All welchers should be removed from the EE".-Aimless
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Originally Posted By Firulais: Thanks to both of you for your answers. I had some doubts about the raised C, but after some research, they were also made that way for some years in the mid-2000s. Only the bolt doesn't belong there. It's all USGI legit, including the bolt. Just one of several contract components used by Colt. |
"All welchers should be removed from the EE".-Aimless
Joined:
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