FASCINATION ABOUT COLT UPPER FOR SALE

 Actually, I wouldn't shoot one.  Time to maneuver on to a different rifle.  Get an LMT or HK if you like military services design and style pistons.    Colt has no real interest in helping you out.  They abandoned that job prior to their very last individual bankruptcy.The Colt LE6943CQB and CR6943 Monolithic shorter barreled rifle character