WHAT DOES KAC RAS RAIL MEAN?

The IBN process permits the rail by itself to act since the barrel nut when torqued on to the rifle, fully reducing the necessity for the different steel barrel nut. M-LOK add-ons might be mounted any place together the URX 4?s length, which makes it one of the most person configurable layouts available.?When stowed in the folded situation, the M4â