This is a suppressor made for an Airsoft pistol. It is not made with threading and if you want it to stay on permanently, I would recommend super-gluing it. The pistol that i'm using is a Co2 Walther P99 blowback and most of the noise was caused by the blowback so I modified the gun and disabled that. In short I would use this for a non-blowback Airsoft pistol. Hope it works for you as much as it does for me! Enjoy!