Compensators for the shooter who demands the best. These were designed and manufactured by Grand Power- maker of competition production pistols. These comps help reduce muzzle rise and reduces flash. 14x1mm right hand thread. Condition: New.State and Federal restrictions may apply. The use of this foreign part on certain semi-automatic rifles already assembled with 10 foreign parts may place the end user in violation of federal law (27 C.F.R. s. 478.39). Please consult with the original manufacturer or importer of the firearm if you have any compliance questions regarding the use of this part.