After dealing with a customer that threaded a 13.5 X 1 LH thread comp on to a 1/2 X 28 right hand threaded barrel and destroyed 2 comps. If you order this comp and install it on a barrel other then the barrel that is listed or damage the comp it’s your fault. Have your compensator properly installed by a licensed Gunsmith. This is the Range18 SIG Sauer P320 9MM Compensator with serrations works with the Sig Factory 13.5 X 1 Left Hand Thread Threaded barrel. It is recommended that these compensators be installed by a qualified gun smith. Damage to the threads can accrue when the comps is installed improperly. Do not use this compensator on a 1/2 X 28 Right Hand threaded Barrel. This is the New Range18 Sig P320 Compensator. The profile of the compensator is the same as the Sig Sauer P320 slide. The Range18 Sig P320 9MM Compensator works with the Sig Factory 13.5 X 1 Threaded barrel. Does not work with FAXON Barrels. The compensator is Anodized in black finish and will work with factory loads. The Range18 has been tested with the factory recoil spring. 100% US Made Anodized Black Sig 9MM Range18 Compensator. These finely designed and crafted Compensators are CNC machined out of one piece solid billet aluminum. The Range18 Compensators are 100% US made. The Range18 Compensator was designed to add to the look and performance of the Sig Sauer P320. The Range18 Compensator comes Anodized in a flat Black finish. This Range18 Compensator was designed for the Sig P320. The Compensator redirects gas reducing felt recoil. Second, the redirection of gas vertically provides a genuine reduction in muzzle rise. The result allows the shooters sights to remain on target or realigned quickly providing faster accurate follow up shots. The Range18 Compensator was designed with a set screw to prevent it from rotating on the barrel after installation. The Range18 was designed to give the appearance that it is a factory part. The Range18 Compensator maintains the same profile as the Sig Sauer Slide giving it a clean installed look along with the added performance.