Dark Storm Industries DS-15 Carbine Heavy Buffer System Kit Black. Only the best heat treatments and finishes for the DSI DS-15 Carbine Heavy Buffer System. Specifications for Dark Storm Industries DS-15 Carbine Heavy Buffer System Kit: Manufacturer: Dark Storm Industries Color: Black Features of Dark Storm Industries DS-15 Carbine Heavy Buffer System Kit DSI Carbine Mil-Spec Buffer Tube: Mil-Spec Sized Machined from 7075 Aluminum with Roll Formed Threads 6 Position Adjustibility with SOCOM Drain Holes MIL-8625 Type III Hardcoat Anodizing Mil-Spec Everlube Dry Film Coated Inside DSI Carbine Buffer Spring: Mil-Spec 17-7 Stainless Steel (not piano wire) Mil-Spec Heat Treated for Long Life Electropolished for Reduced Friction DSI Buffer Nut: Machined from 4140 Cromoly Steel Nitride Heat Treaded for Stregth and Corrosion Resistance Enhanced Round Staking Holes for Stronger Engagement DSI Buffer End Plate: Stamped Steel Black Oxide Finish DSI Carbine 4.5 oz Buffer: 6061 Aluminum Body High Durometer Blue Polyurethane Bumper 4140 Steel Dead Blow Weights EPDM Weight Spacers Engraved Face Showing Weight For carbine length buffer systems Length: 3.3in (84mm) Package Contents: Dark Storm Industries DS-15 Carbine Heavy Buffer System Kit DSI Carbine Mil-Spec Buffer Tube DSI Carbine Buffer Spring DSI Buffer Nut DSI Buffer End Plate DSI Carbine 4.5 oz Buffer Dark Storm Industries DSI-BFR-KIT-C556H: DS-15 Carbine Heavy Buffer System Kit Black