Sons of Liberty Gun Works Maritime 10 Position Buffer Tube Kit

Sons of Liberty builds parts for people finishing a rifle, and this kit covers the back end of an AR lower in one box. You get a 10 position buffer tube, a buffer, an extra power spring, a castle nut, and an end plate. That is everything needed to hang a collapsible stock on a mil spec lower, with no hunting around for the small parts that always come up missing.

The extra power spring is the piece worth noting, since it is stiffer than the standard issue spring packed with most tube kits. Sons of Liberty states these small parts fit most mil spec firearms, so the kit works for a fresh build or as a replacement for a tube that has been beat up.