Colt 604 M16 Upper Assembly 1966-1967, 20" Barrel, 5.56X45 NATO, A1 Flash Hider, *Good*

Early Colt Model 604 Upper Receiver Assembly 1966-1967, 20" Barrel, 5.56x45 NATO, black triangle handguard with 1 small crack, with A1 flash hider & charging handle, bolt carrier assembly, in *Good* condition.

Sold Individually. (Upper pictured is the one you will receive.)

Own a part of history with this collectible Colt Manufactured upper assembly!
M16 upper receiver with numbered rear sight knob and raised arrow directional markings.
Early 604 "MP" (magnetic particle) marked barrel.
These were mated to a slabside receiver with No forward assist or casing deflector.
Possible years of production on this assembly are between 1966 and 1967.
These receiver assemblies have the Colt proof marks on the front right side of the receiver.
Non-chrome lined bore is in *Good* condition.
Black polymer triangle type handguards are in *Good* condition, with a small crack on the underside of the left handguard.
Includes proper M16A1 charging handle, forward assist notched bolt carrier assembly and A1 type flash hider.
Lower assembly, FCG parts and buttstock are NOT included.

This Upper Assembly includes:
- Vietnam Era M16A1 triangle type handguard assembly with handguard cap and straight barrel nut assembly.
- Early forged type front sight base.
- Fixed rear sight bridge, L-shape sights with windage adjustment. 
- M16 style carry handle upper, with dust cover, early bend gas tube.
- 20" barrel with A1 type "Birdcage" flash hider.

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.