USED Bravo Company MFG Stock Assembly - Mod 1 - Sopmod Widebody Compartment Black - BCM-GFS-MOD-1-SPMD-BLK. Longer Overall Length To Fit Longer ''milspec'' Diameter Ar10/a5/intermediate Receiver Extensions. Storage Compartment Located In The Toe Of The Stock Accessible Through Butt Pad. Two Different Ambidextrous Sling Mounting Options. Built In Rubber Butt Pad For Secure Shoulder Placement. Package Contents: Bravo Company MFG BCMGUNFIGHTER Stock Assembly - Mod 1 - SOPMOD Widebody Compartment What firearm models does the manufacturer say Bravo Company MFG BCMGUNFIGHTER Stock Assembly - Mod 1 - SOPMOD Widebody Compartment is compatible with? The manufacturer suggests that Bravo Company MFG BCMGUNFIGHTER Stock Assembly - Mod 1 - SOPMOD Widebody Compartment is compatible with AR-15