Whether building from the ground up or replacing existing parts, this is the Mil-Spec profile receiver extension build kit you need. It includes an M4 buffer tube, castle nut, TAPCO end plate sling adaptor, buffer, and recoil spring. It is made in the USA.
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Type : Extension Tube
Model : Mil-Spec
Finish : Black
Material : 7075 T6 Aluminum
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