Dark Storm Industries Buffer System Kit Carbine. Only the best US sourced materials and the best heat treatments and finishes for the DSI DS-15 Carbine Buffer System. Specifications for Dark Storm Industries Buffer System Carbine Kit: Manufacturer: Dark Storm Industries Color: Black/Stainless Steel Last Chance: Yes Features: DSI Carbine Mil-Spec Buffer Tube Mil-Spec Sized Machined from 7075 Aluminum with Roll Formed Threads 6 Position Adjustability 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 3.0 oz Buffer 6061 Aluminum Body Dark Grey Mil-Spec Type III Hardcoat Anodized High Durometer Red Polyurethane Bumper 4140 Steel Dead Blow Weights EPDM Weight Spacers Engraved Face Showing Weight For carbine length buffer systems Package Contents: Dark Storm Industries Buffer System Carbine Kit Dark Storm Industries DSI-BFR-KIT-C556: Buffer System Kit Carbine