NOT KNOWN FACTS ABOUT COLT 20 UPPER

The present-day M16/M4 rifle is crafted around the idea of modularity. Most of the BCM® flat prime uppers aspect a USGI kind laser etched T-marks to deliver addressing for your remounting of tactical accessories including optics, laser sights, etcetera.  This is a new upper receiver group, taken off an entire Colt rifle.  Ships in armed forces q