Best buffer tube on the market - Primary Weapons Systems PWS Enhanced Buffer Tube, Mil-Spec Gen 2 Ratchet Lock Endplate

This is an excellent buffer tube system: stiff, lightweight, and an innovative design. Comes with an end plate with QD mount and castle nut that lock in place without staking. Very easy to install. Mine arrived from Optics Planet without the end plate in a slightly opened plastic pack. I emailed Primary Weapons Systems, received a response within a few hours, and they shipped a replacement that arrived with 72 hours. Excellent customer service.