5.56/16". 6.6 lbs. Military replica rifle made to FN’s and the U.S. military’s specifications. 1:7" RH twist barrel, button-broached, and chrome-lined. UID-labeled lower receiver is equipped with an ambidextrous selector switch, just like the select-fire M4A1. LE-only M4 model number is 36318-02. Similar Military Collector M16 36320 has a 20" barrel, Knights Armament M5RAS Adapter rail w/ rail adapter covers. 8.2 lbs. Consumer model number 36320, LE is 36320-02.