***THIS IS A PRE-ORDER; LEAD TIMES MAY APPLY.***

Use 1/2x28 threaded devices by using our precision machined 10×1 mm to 1/2-28 thread adapters.

Made from fatigue resistant, high carbon steel, our thread adapters have been hardened to increase resistance to wear and fatigue. When attached to the Jarvis FN 5.7 x 28 threaded barrel, the adapter/barrel combination have a T.I.R. (Total Indicator Reading) of 0.003″ or less