5.56 NATO cal., GPO, 16 3/4 or 18 in. Lothar Walther barrel, 5, 10, 20, or 30 shot mag., folding MBUS sights, telescopic 6-position collapsible M4 or A2 stock, ergonomic beavertail pistol grip, aluminum alloy frame and upper receiver made on CNC, four-position adj. gas block, free float handguard with four fixed rails or KeyMod system in four different lengths, approx. 7.5 lbs.