THE DEFINITIVE GUIDE TO COLT M4 CARBINE

IIRC, it was when rifles stopped transport using a carry tackle, sling, cleaning package, metal mags and began displaying up with the MBUS in addition to a 30 Pmag.+1 the Troy MLOKs do the job really well if you don't need to tug the gasoline block and replace the barrel nut. For anyone who is fantastic with changing the barrel nut then sky's the l