Colt 604 M16 Upper Assembly, 20" Govt. Profile Barrel, Bolt Assembly, A1 Birdcage, Unmarked Receiver, 1/7 Twist 5.56x45 NATO *Very Good*

Colt M16 604 Upper Receiver Assembly, 20" Govt. Profile Barrel, a1 birdcage flash hider, triangle handguards, Colt bolt carrier assembly, 1/7 twist, 5.56X45 NATO, in *Very Good* condition.

Sold Individually.

Own a part of history with this early Colt Manufactured upper assembly!
Numbered rear sight knob with directional markings on receiver.
Late forged front sight base without the drain hole, square sight post.
A2 government profile barrel is marked "C MP 556 NATO 1/7.
The bore is in Very Good condition with light wear.
The receiver is unmarked, manufacturer unknown.
Triangle handguards with straight barrel nut assembly.
Some cracks and breaks on the bottom side of the handguard.
Dust cover needs some straightening or repair to work properly.
Unmarked colt bolt carrier assembly with forward assist, and early staking on the gas key.
Gray finished upper receiver and charging handle.
A1 birdcage type flash hider.
Counterbored small hole front pivot pin.
Lower assembly, FCG parts and buttstock are NOT included.

This Upper Assembly includes:
- Early M16 triangle type handguard cap with triangle handguards, and straight barrel nut assembly.
- Forged front sight base with hole and square sight post.
- L shape rear sight with windage adjustment. 
- M16 A1 style carry handle upper.
- 20" barrel with A1 birdcage type flash hider.
- Unmarked bolt carrier with forward assist and early style staking on the gas key.
- Early bend gas tube.

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 surplus parts without proper knowledge could cause a firearm to malfunction and cause property damage, injury or death.