Tiger Rock AR-10/LR-308 Carbine Length Buffer Spring Black Small. It's 11.25in long made of steel and finished in matte black. Specifications for Tiger Rock AR-10/LR-308 Carbine Length Buffer Spring: Manufacturer: Tiger Rock Color: Black Finish: Matte Black Fabric/Material: Steel Gun Make: AR Platform DPMS Gun Model: DPMS LR-308 AR-10 Gun Type: Rifle Length: 11.25 in Weight: 2.36 oz Features of Tiger Rock AR-10/LR-308 Carbine Length Buffer Spring Commercial and Mil-Spec Package Contents: Tiger Rock AR-10/LR-308 Carbine Length Buffer Spring What firearm models does the manufacturer say Tiger Rock AR-10/LR-308 Carbine Length Buffer Spring is compatible with? The manufacturer says that Tiger Rock AR-10/LR-308 Carbine Length Buffer Spring is compatible with AR-10 DPMS LR-308Tiger Rock S308: AR-10/LR-308 Carbine Length Buffer Spring Black Small