SilencerCo Piston .578 x 28 XL AC1346
SilencerCo Piston .578 x 28 XL AC1346, The SilencerCo .578x28 piston is constructed out of heat-treated stainless steel and can be easily changed to fit with different host weapons/calibers. As a component of the Nielsen device, these pistons enable consistent semi-automatic cycling and contain female threads to fit them onto different host weapons. Disclaimer: All NFA rules apply