Colt 604 M16 Upper Assembly 1964-1965, 20" Barrel, 5.56X45 NATO, Improved 3-Prong Flash Hider, *Good*

Early Colt Model 604 Upper Receiver Assembly 1964-1965, 20" Barrel, 5.56x45 NATO, black triangle handguard, with improved 3-prong  flash hider, slickside bolt carrier assembly, in *Good* condition.

Sold Individually.

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 "M" (magnetic particle) marked barrel with "12" (1/12) marking 1 inch back from muzzle.
These were mated to a slabside receiver with no forward assist or casing deflector.
Possible years of production on this assembly are between 1964 and 1965.
These receiver assemblies have the Colt proof marks on the front right side of the receiver.
Bore is in *Good* condition.
Black polymer triangle type handguards have some damage on the upper right hand side (as pictured).
Includes proper/later M16A1 charging handle, slick side bolt carrier assembly and the improved 3-prong 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 with L-shape sights and windage adjustment. 
- M16 style carry handle upper, with early bend gas tube.
- 20" barrel with 3-Prong improved 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.