This Yankee Hill 431536A Mini QD Flash Hider uses 1/2x36 threads and is compatible with 9mm and smaller calibers. It is suppressor ready for the Turbo T2's, Turbo K's, Resonator's, Resonator R2's, Resonator K's, Nitro .30, all Phantom .30 caliber suppressors, as well as our new R9 9mm, NITRO N2O sound suppressors and Wraith 9 XL.