BCM GFSK-MOD2-RMS-BLK STOCK KIT MOD 2 WIDEBDYThe Mod 2 fits on Mil Spec carbine receiver extensions, and optimized for intermediate length receiver extensions (MK2, AR10, A5). These improved lines also enhance shooting in the prone position while remaining snag free, with no edges to catch or tangle in slings, antenna, or other PPE. Includes: BCM Stock Mod 2 Black BCM MK2 Receiver Extension (approximately 3 4 longer than carbine), 7076T6, 8 position, Mil Spec diameter Mil Spec M16A4 Rifle Action