Colt 604 M16 Upper Assembly 1970-1973, 20" Barrel, 5.56X45 NATO, A1 Flash Hider, *Very Good*

Colt Model 604 Upper Receiver Assembly 1970-1973, 20" Barrel, 5.56x45 NATO, black triangle handguard, with A1 flash hider & charging handle, bolt carrier assembly with serrations, in *Very Good* condition.

Sold Individually.

Own a part of history with this collectible Colt Manufactured upper assembly!
M-16 upper receiver with numbered rear sight knob and raised arrow directional markings.
Late 604 "C MP B" (Colt, magnetic particle, proof fired, chrome bore) 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 1970 and 1973.
These receiver assemblies have the Colt proof marks on the front right side of the receiver.
Chrome lined bore is in *Very Good* condition.
Black polymer triangle type handguards are in *Very Good* condition.
Includes proper M16A1 charging handle, forward assist serrated 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.
- Late forged type front sight base.
- Fixed rear sight bridge with L-shape sights and windage adjustment. 
- M16 style carry handle upper, with rectangle dust cover, late bend gas tube.
- 20" barrel with A1 type "Birdcage" flash hider.
- Chrome lined bore.

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.