This complete Upper Receiver/Barrel Assembly includes the following: Bolt/Full auto carrier, charging handle, flip-up front battle sight, flip up Matec rear sight. Matech is the standard government issue rear back-up sight on all M4's under the currrent contract. Also comes with 3 ladder-style rail protectors, pivot pin offset screw and is packaged in Col's Custom Shop box (nice!!).
The barrel is a 16" chrome lined, 1:7 twist. The barrel and upper receiver have M4 feed ramps. Barrel and bolt are high-pressure tested and magnaflux inspected.
The upper receiver is machined from a single aluminum forging. The upper has a continuous upper rail with a free-floating barrel. The forward end of the rail features a right and left side mounting point for a QD sling loop. The bottom rail is removable via a recessed push-in lock which does not require any special tools.
Link to Colt 6940 Upper on our Site