The Herrington Arms HC3652P Compensator is designed to work with Sig Sauer P-365 series. The HC365 will work with the stock springs provided your gun has gone through our recommended break in period of 500 rounds factory new ammunition is used with the threaded barrel you intend to use with the firearm before installing a compensator. We designed this comp with close retention shooting in mind. The P365 is a popular carry gun and we received some feedback from customers wanting a top port only design to mitigate on gas escaping from the side ports towards the shooters face. The comp is also very helpful for a smaller platform like the P365 because they inherently have a lot of vertical recoil due to their size. With 2 enlarged top ports only, the HC3652P significantly cuts down on on the vertical recoil of the smaller P365 platform. When testing this compensator, we have data showing 27.5% muzzle flip reduction depending on what 9mm load and 365 model is used. Product Features Engineered to greatly reduce vertical and horizontal recoil of your gun 2 port design to mitigate vertical recoil and be friendly to close retention shooting With the XL Tactical Development rail you can achieve an integrated look Product Specifications Material: 7075 Aluminum Finish: Black Anodized finish and FDE Cerakote Compatibility: p365, p365x, and p365xl, P365 fuse - fits 1/2-28 threaded barrels and most aftermarket barrels. Included: 1/16 Allen key, Steel replacement 6-32 set screws Length: .96" long DOES NOT WORK WITH KKM OR BARSTO BARRELS