NOT KNOWN FACTS ABOUT COLT UPPER RECEIVER FOR SALE

The present-day M16/M4 rifle is created around the strategy of modularity. All the BCM® flat leading uppers element a USGI form laser etched T-marks to provide addressing to the remounting of tactical add-ons for example optics, laser sights, etc.  This can be a new upper receiver group, taken off an entire Colt rifle.  Ships in army grade plast