BUSHMASTER® CM-15 - MFT™ POLYMER QUAD RAIL w/RAIL COVERS - M4 CONTOUR BARREL w/A2 FLASH HIDER •Carbine-15 composite lower & aluminum flat top railed upper receivers •4150 Chrome-Moly steel threaded (1/2"-28TPI) barrel •Fixed front sight base (except on Superlight ORC*) •6-position collapsible stock •Matte black finish •Includes bayont lug sling attachment chamber flag & (1) mag. •OAL: apx. 33" •Wt.: apx. 6.5 lbs. Cal.: 5.56 NATO - Cap.: 30 - Brl.: 16"