link to ad in the EE
cut and paste of the ad :
for sale, 2 colt original car-15 stripped aluminum upper receivers(no barrels,handguards,sights,or ejection cover)these are the pre-forward assist units.make a nice xm177e original shorty vietnam era . or you can make a 9mm drop in conversion upper using parts acquired br brownell's in iowa. $200.00 each.like new.plus shipping
these would work good for making those dept of energy orig colt short barrelled uppers
these are the original i believe 604 uppers from the first production runs of the ar-15 pre m4
large hole front,1 has cm below rear sight,other, ch.
CH Colt / Harvey Aluminum (1st Colt Forgings) (sold 12/17/2011)
CM Colt / Martin Marietta (See above
paying $200 plus shipping for a stripped, late SP1 upper receiver is just