The GEMTECH Lunar 9 suppressor features an innovative baffle design that allows it to be converted from a longer, 7" suppressor to a shorter 4.7" suppressor while still being hearing-safe. The GEMTECH Lunar 9 suppressor is compatible with a variety of threaded barrel pistols, carbines, and rifles chambered for 9mm. All silencers require the purchase of a $200 Federal Tax Stamp. Suppressors have become remarkably popular in the firearms industry. Order yours through Guns.com today!