Diemaco (Colt Candada) M4 Upper Receiver Keyhole Cerro Forge (NEW) $185.00 out of stock Notify Me. USED. Colt M4 Upper Receiver C Marked Cardinal Forge. $149.95 out of stock Notify Me. USED. FN M4 CAGE CODE 3S679 C SQUARE FORGE (USED SURPLUS) $104.95 out of stock Notify Me. USED. MSI M4 Cage Code Upper 1KW91 SURPLUS ...

The upper comes with Complete with a KAC M4 RAS handrail with 3 KAC ribbed covers, Colt heavy profile SOCOM barrel (standard SOCOM with M203 cuts), Matech GI issue rear BUIS and genuine Colt complete BCG.

AO Precision M4 Flat Top Upper Receiver - Stripped - $36.75 Discover the pinnacle of tactical performance with AO Precision's True Mil-Spec M4 Flattop Upper Receiver. Designed for unparalleled compatibility and reliability, this upper receiver is the ideal choice for custom AR-15 builds. FEATURES

Colt AR-15 / M4 Upper Receiver, No Parts Fitted, Custom Camo Pattern *Excellent*

Check out the selection of complete M4 upper receivers from 80% Arms! Complete your lower build with one of our M4 uppers. Shop today!

This receiver has an enlarged ejection port. We recommend using this upper receiver on 6MM ARC, 6.5 Grendel, 7.62x39mm, and any other barrel/caliber that has M4 style feed ramps. However, this receiver can also be used on upper receivers that are firing a standard caliber like .223 Remington, 5.56x45mm, and .300 Blackout.

Browse a huge inventory of Upper Receivers Rifle Receivers & Parts For Sale Online Up To 32% Off + Coupon with 4.5 on 883 Review(s) from Verified Buyers.

Colt M4 Upper Receiver C Marked Alcoa Forge. MODEL/DESC: M4 C Marked Alcoa Forge (Used Surplus)

Nice Tanodized/clear square forged upper receiver. Listed used as I got it in a trade, but upper looks brand new. M4 feedramps with a nice tan/clear even anodizing. Perfect start for your next build..