S2Delta X-BTS Buttstock Black. Adjustable length of pull and cheek riser without tools. Manufactured from aluminum and fiber reinforced nylon. AR15 carbine interface but will NOT accommodate a buffer for semi automatic rifles. Features ambidextrous QD sling bases. Tool-less length of pull and check rise adjustment. Specifications for S2Delta X-BTS Buttstock: Manufacturer: S2Delta Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Color: Black Stock/Brace Material: Aluminum Length: 10.75 in Weight: 20 oz Condition: New Package Contents: S2Delta X-BTS Buttstock What firearm models does the manufacturer say S2Delta X-BTS Buttstock is compatible with? The manufacturer suggests that S2Delta X-BTS Buttstock is compatible with AR-15S2Delta X-BTS-BLK: X-BTS Buttstock Black