TPRCSN Barrel, 9MM, Copper, Thread Protector, Threaded, Sig P365 TP-P365B-XTC True Precision has earned their name by making superior quality aftermarket barrels that are designed to deliver the best accuracy possible from your pistol. These drop-in barrels feature improvements over the original factory barrels such as added chamfering" improved radius cuts" and upgraded feed ramp design that allows for more reliable feeding of defensive style ammunition. True Precisions barrels also offer an improved fit compared to OEM barrels" and the tighter the barrel is" the better accuracy your pistol will have. This is a threaded barrel and is threaded 1/2 x 28 for attaching a compensator" suppressor" or any other compatible muzzle device.