Colt M4 RO977AU Upper, 14.5" 1/7 CL BBL, Low Profile Gas Block, Knights Rail, 5.56X45 NATO, Australian Contract *EXCELLENT / Blemished / IN BOX*

Colt M4 R0977AU Upper, 14.5" inch long, 1 in 7 twist chrome lined barrel, Low Profile Gas Block, Knight's armament rail, 5.56X45 NATO, Australian Contract, *Excellent / Blemished / IN Box*

Sold Individually.

Get this collectible Australian contract upper receiver.
Colt manufactured flat top upper receiver with M4 Gov't profile barrel with low profile gas block.
Includes carbine length Knights Armament picatinny handguard rail with standard handguard cap.
Receiver marked with Square forge marking.
Scuffs and light scatches from factory test firing and storage.
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.
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.
- Knights Armament picatinny quad rail handguard with low profile gas block.

NO rear sight, charging handle, bolt carrier assembly or carry handle. 

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 #: R0977AU / SP401753 B-Model