THE BASIC PRINCIPLES OF M4 CARBINE OEM1

IIRC, it had been when rifles stopped transport using a carry deal with, sling, cleansing package, steel mags and started showing up with the MBUS and a thirty Pmag.+1 the Troy MLOKs work very well if you do not need to pull the gas block and substitute the barrel nut. Should you be fantastic with replacing the barrel nut then sky's the Restrict, g