Tiger Rock AR-15 Carbine Length Buffer ring Black. Fits 6-Position adjustable stock tube Specifications for Tiger Rock AR-15 Carbine Length Buffer Spring: Manufacturer: Tiger Rock Color: Black Finish: Matte Fabric/Material: Solid Steel Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Buffer Tube Length: Carbine Length Length: 10.75 in Weight: 1.9 oz Package Contents: Tiger Rock AR-15 Carbine Length Buffer Spring What firearm models does the manufacturer say Tiger Rock AR-15 Carbine Length Buffer Spring is compatible with? The manufacturer suggests that Tiger Rock AR-15 Carbine Length Buffer Spring is compatible with AR-15Tiger Rock S: AR-15 Carbine Length Buffer Spring Black