Guntec USA AR-15 Pistol Buffer Tube

A pistol buffer tube for AR-15 builds from Guntec USA. The receiver extension threads into the back of the lower and houses the buffer and action spring that cycle the bolt carrier group, so it is doing real work rather than just holding a stock. This one is cut for pistol builds and carries no stock mounting hardware.

Anyone assembling an AR-15 pistol needs a tube of this type instead of a carbine stock tube. Match the buffer and action spring to the rest of the build before assembly, and check the fit of anything you plan to slide over the tube, since sleeve and brace bores vary by maker.