COLT 9MM UPPER FUNDAMENTALS EXPLAINED

The upper is often a flat top, obviously, and comes with many of the standard Mil-Spec enjoyable things like a dust address and ahead aid.  I have not decided on a flat best or A1 (with out FA and deflector).  I'm imagining a 16" flattop, in addition to a ten.five" with have handle like yours.  I have several Aero slick uppers Along with the de