BCM Stock Kit Mod 2 Widebody is a black buttstock kit featuring the BCM Mod 2 stock with a patented internal latch system and ambidextrous rotation-limited QD sling interface. Recontoured into a patented semi-clubfoot design, it fits Mil-Spec carbine receiver extensions and is optimized for intermediate length receiver extensions (MK2, AR10, A5). Features a removable buttpad, an improved VBOST sling retention tab, plus two additional web sling attachment slots, and a snag-free profile for prone shooting. Kit includes an 8-position BCM MK2 receiver extension (Mil-Spec diameter, ~3/4 longer than carbine), Mil-Spec M16A4 rifle action spring, BCM MK2 Mod 1-T0 buffer (~3.8 oz), BCM EPM4 end plate with QD swivel mount, and an M4 castle locking nut. Made in Hartland, WI, USA. Safety note Follow all manufacturer installation instructions. Verify proper function and secure mounting before use. Comply with local firearm laws and regulations.