Colt SP-1 Carbine Upper 16" (NO Bolt or Carrier).
Same owner for last 20 years (Ret. Army-SF)
Has been in the back of the safe for last 5.
Barrel stamped "C MP B" and "C" "K" near windage knob.
This is a large forward (hinge) pin Upper.
Has the original full birdcage flash hider and handguards.
Upper shots well and functions flawlessly. Has aprox 10,000 rnds through it.
Email at-- (firstname.lastname@example.org)