All critical alignment features machined in one set up. Compatible with common .900-24 silencer mounts. 395 bore for 9mm or smaller projectiles. 13/16 rear hex for easy installation and removal. CNC machined from 17-4 PH stainless steel. Heat treated to H900 condition. Minimal concussion. 360 degree port orientation-no shims required. 1.3-1.6 ounces, 1.1 total length.