Primary Weapon Systems Nielsen Piston 13.5x1 LH Suppressor Piston

The Primary Weapon Systems Nielsen Piston is a replacement piston for 13.5x1 left-hand threaded suppressors, used to adapt the host suppressor to its intended firearm or configuration. It is made from 17-4 stainless steel and finished in black.

The piston is listed as compatible with the PWS BDE 9 and other 13.5x1 LH host suppressors, including models from Rugged, SilencerCo, Lone Wolf, and Griffin. Its left-hand thread pitch of 13.5x1 must match the host suppressor to install correctly.