Colt M4 LE6921 Upper, w/ Bolt Carrier Assembly, w/Charging Handle, 14.5" 1/7 CL BBL, Matech Rear Sight, 5.56X45 NATO *B-Model IN BOX*

Colt M4 LE6921 Carbine Upper Assembly, with bolt and carrier assembly & charging handle, 14.5" long 1 in 7 Chrome Lined barrel, Matech Rear Sight, 5.56X45 NATO, in *B-Model in box*.

Sold Individually.

Get one of these high quality upper assemblies for your build!
Colt manufactured flat top upper receiver with M4 Gov't profile barrel.
Includes standard oval handguards.
Receiver marked with Square forge marking.
Chrome lined Gov't profile barrel is marked 13629 MP 5.56 NATO 1/7.
1 in 7" Twist Rifling is capable of stabilizing light to medium weight projectiles of up to about 77 grain.
MATECH BUIS rear sight with adjustable windage, elevation, and quick range adjust out to 600 yards.
Light handling on upper receiver, front sight assembly is finished dark gray.
This upper has passed all safety and testing conditions from the factory.
Packed in factory box (pictured)

This Upper Assembly includes:
- Colt manufactured M4 type flat top upper, case deflector and forward assist assembly.
- A2 style birdcage flash hider, 1/2x28 muzzle threading.
- Colt manufactured M4 Gov't profile barrel, 5.56 NATO with M4 feed ramps and 1 in 7 twist rate.
- Colt manufactured MPI marked bolt and carrier assembly with charging handle.
- 14.5" Colt factory barrel with Gov't profile.
- Matech BUIS rear sight with quick adjust elevation ranging between 200-600 yards.

NOTE: Prior to installing this length of barrel into a rifle a NFA Form 1 must be completed and returned approved.
A 14.5 Inch length barrel installed into a shoulder fired firearm is a "Short Barreled Rifle" under the NFA. 

Parts must be inspected and tested by a qualified and competent gunsmith or armorer before use in a firearm.
Not all firearm parts are interchangeable; use of new parts without proper knowledge could cause a firearm to malfunction
and cause property damage, injury or death.

Colt Part #: LE6921CK B-Model