Guntec USA AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser Matte Black. 308 Cal M.C.S Stock (Multi Caliber Collapsible Stock) W/ Adjustable Cheek Riser Specifications for Guntec USA AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser: Manufacturer: Guntec USA Color: Black Stock/Brace Material: Aluminum Gun Model: AR-15 Length: 8.7 in Gun Make: AR Platform Weight: 25 oz Features of Guntec USA AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser Complete With Buffer Tube End Plate Castle Nut .308 cal Buffer & Chrome Recoil Spring Adjustable Cheek Riser with 6 Different Heights Cheek Riser has Multi Point Locking System Multiple Cutouts To Reduce Weight Accepts QD Sling Swivel On Left Or Right Side Heavy Duty Design Package Contents: Guntec USA AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser Neoprene Rubber Buttpad What firearm models does the manufacturer say Guntec USA AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser is compatible with? The manufacturer suggests that Guntec USA AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser is compatible with AR-15Guntec USA MCS-308-R: AR .308 Cal M.C.S Stock W/ Adjustable Cheek Riser Matte Black