Colt 604 M16 Upper Assembly, 20" Barrel, 3-Prong Flash Hider, Bolt Assembly, Charging Handle, 1966-1967, Grey Finish. 1/12 Twist 5.56 NATO *Good*

Colt 604 Upper Receiver Assembly 1966-1967, 20" Barrel, 3-prong flash hider, triangle handguards, charging handle, bolt and bolt carrier assembly, early grey finish, 1/12 twist, 5.56X45 NATO, in *Good* condition.

Sold Individually.

Own a part of history with this early Colt Manufactured upper assembly!
Possible years of production on this assembly are between 1966 and 1967.
Numbered rear sight dail with raised arrow directional marker on the receiver.
Front sight is circle post, with front sling swivel.
Barrel is marked "MP" between the rear sight ears and "12" near the muzzle.
Colt proof marks on the front right side of the early slick side receiver.
The bolt carrier has the forward assist serrations and "C" Colt markings.
Bolt is marked for magnetic partical inspection.
Triangle handguard retainer with circle handguards.
Original slickside type upper receiver, forged front sight base with the drain hole, and 3-Prong "Improved" flash hider.
Lower assembly, FCG parts and buttstock are NOT included.
Some light pitting in the non-chrome lined bore.
No ejection port cover.

This Upper Assembly includes:
- Early M16 triangle handguard cap with A2 circle handguards, and straight barrel nut assembly.
- Forged type front sight base.
- Early L shape 2 aperature rear sight with windage adjustment. 
- M16 carry handle upper.
- 20" barrel with 3-prong "Improved" type flash hider (NOT the Duckbill).
- Colt bolt carrier assemly with forward assist serrations.
- 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.