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KAK Industry Mil-Spec Carbine Buffer Tube kit- Reciever Extenssion 

Kit includes Buffer Tube, Carbine Buffer, Castle Nut, End plate, and Chrome Silicon Spring

Number of positions- 6

Buffer Weight- Carbine 3oz

Material- High Quality 7075 Aluminum

Finish- Black Military Hard Coat Anodize

Uses standard/ Milspec end plate and castle nut

Accepts AR15 buffers and springs