Colt 604 M16 Upper Assembly, 20" Pencil Barrel, A2 Round Handguards, 1966-1968, 5.56 NATO *Good*

Colt 604 Upper Receiver Assembly, 20" Pencil Profile Barrel, Birdcage Flash Hider, A2 Round handguards, 5.56X45 NATO, in *Good* condition.

Sold Individually.

Own a part of history with this early Colt Manufactured upper assembly!
Possible years of production are between 1966 and 1968.
Numbered rear sight dail with raised arrow directional marker on the receiver.
Barrel is marked "MP" and "C", chrome chamber (not chrome bore).
Colt proof marks on the front right side of the slab side receiver.
Circle handguards show use and wear, but no cracks.
Original slabside type upper receiver, forged front sight base with the drain hole, and birdcage flash hider.
Lower assembly, bolt assembly, FCG parts and buttstock are NOT included.
Some light pitting in the non-chrome lined bore.
The ejection port cover may need some work to stay closed.
Counterbored small hole front pivot pin.
Early gray color receiver.
There is a plate fixed to the left side of the receiver with a cage code.

This Upper Assembly includes:
- Late M16A2 style circle handguards and straight barrel nut assembly.
- Forged type front sight base with drain hole and circle sight post.
- Early L shape 2 aperature rear sight with windage adjustment. 
- M16 carry handle upper.
- 20" pencil barrel with with birdcage flash hider.
- 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.