KAK Indsutry AR15 A5 Style Buffer TubeNOTE- For AR15 builds our A5 Style Buffer Tube is only compatible with A5 Style Buffers and Rifle Length AR15 buffer springs, do not use standard buffers with the A5 tube for AR15 buildsMaterial- High Quality 7075Finished- Black Military Hard Coat AnodizedPositions- 9Weight- 4ozUses standard milsepc end plate and castle nut THIS TUBE WILL WORK WITH 308 BUILDS USING STANDARD LENGTH AR15 BUFFERS