Colt Forged M4 Upper Receiver Assembly
Built to the correct military specifications
Colt ‘M4’ marked upper. These are not ‘C’ marked. CAGE codes may be roll marked but are normally etched/dot matrix marked.
Features:
- Precision machined to correct Mil-Specs from 7075 T6 Forgings extension, providing the user with superior strength when dropped or when mortaring malfunction clearance drills.
- Fully Assembled with forward assist, and ejection port cover
- Mil-Std 1913 Rail for mounting optics and accessories
- Machined for use with barrels that use an M4 barrel extension
- T-markings for addressing the remounting of optics
- Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap
- Hard Coat Anodized per Mil-A-8625F, Type III, Class2
- Dry Film Lube on interior bore per Mil-Specs
Andrew (verified owner) –
The review from Kaden is correct. The fit of my DD URGI barrel and this Colt upper was the worst I’ve experienced. I lapped the face, and used an .001 shim and some 620 to bed the barrel, and the fit is nice and tight, light taps to send it home. Shim went around just about half of the extension. It’s not the end of the world, but a blem BCM thermal fit upper is $50…..makes me question “cloning” =D
kaden (verified owner) –
out of spec, I have ordered colt lowers from multiple websites and they are all out of spec. Ever since cz acquired colt the have been awful. Rooftop defense is great, if the review was for the site it would be 5/5 but for these colt uppers its 1/5. its basically gambling for a in spec upper and the odds are low
Paul C. (verified owner) –
Brand new in Colt baggie. Decent price, fast shipping!
Paul C. (verified owner) –
New in sealed Colt factory baggie. Great deal for a somewhat hard to find upper. And with the sustenance provided in the shipping container, I will survive another night of guntube videos and scanning my environment for threats through mom’s basement window