Tiger Rock AR-15/AR-10 .223/.308 Buffer Tube Detent Plunger & Retainer Spring Kit Black/Steel. It's compatible with AR-15 and AR-10 buffer tubes in both rifle and carbine lengths. Specifications for Tiger Rock AR-15/AR-10 .223/.308 Buffer Tube Detent Plunger & Retainer Spring Kit: Manufacturer: Tiger Rock Color: Black/Steel Finish: Phosphate Fabric/Material: Stainless Steel Gun Make: AR Platform Gun Model: AR-10 AR-15 Gun Type: Rifle Condition: New Package Contents: Tiger Rock AR-15/AR-10 .223/.308 Buffer Tube Detent Plunger & Retainer Spring Kit Tiger Rock DS: 223 308 Buffer Tube Detent Plunger & Retainer Spring