Six-position mil-spec carbine receiver extension with a fluted 7075 body and the ratchet-lock castle nut and endplate in the box.

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Primary Weapons Systems PWS Enhanced Buffer Tube Mil-Spec Gen 2 Ratchet Lock endplate Black AR-15
The PWS Enhanced Buffer Tube is a six-position mil-spec-diameter carbine extension impact extruded from 7075 aluminum, with an extended carrier support lip, a fluted body, engraved position numbers, and enlarged drain holes. It ships with the ratchet-lock castle nut and endplate, which install with a castle-nut wrench and need no staking.
Add the PWS Enhanced Buffer Tube with Ratchet Lock Castle Nut and Endplate to your build and see how it enhances your platform.