MCR-556-DF/MCR-556 DFM (DUAL FEED)
5.56 NATO cal., short stroke GPO, 16 1/4 in. chrome-lined (DF model only) quick-change barrel, muzzle compensator, left side mounted piston housing, 30 shot mag., dual feed, AR-15 mags., or 100 M27 disintegrating links w/adapter, removable ...