The FN 57-22 silencer by GSL Technology was originally developed for FN in the mid 1990’s for use on the FN Five seveN. It has 10x1mm threads and comes with a 1/2×28 adapter for use on most common .22 caliber firearms.
Rated for 5.7 x 28mm pressures and lower. Designed to be fired completely dry only.
Never use with ammunition that exceeds SAAMI or NATO pressure specifications.