Herrington Arms HCPDPXL Walther PDP Compensator Black. It is made of high-quality 7075 aluminum and coated with either FDE Cerakote or Black Anodized finish to compliment your specific PDP configuration. The HCPDPXL will work with the stock springs provided your gun has gone through SURPASSING the break in period of 500 rounds factory new ammunition with the threaded barrel you intend to use with the firearm before installing a compensator. We came out with the XL model due to the high bore axis of the PDP series. The 2 enlarged top ports on PDPXL comp cut down on the muzzle flip and vertical recoil of the PDP series. Fits on 1/2-28 threaded barrels and most aftermarket barrels. Specifications for Herrington Arms HCPDPXL Walther PDP Compensator: Manufacturer: Herrington Arms Fabric/Material: 7075 Aluminum Threads per Inch: 1/2x28 Gun Make: Walther Gun Model: Walther PDP Features of Herrington Arms HCPDPXL Walther PDP Compensator HCPDP Compensator passed our 4000-round testing sequence without any issues REQUIRES A 1/2-28 THREADED BARREL DOES NOT WORK WITH KKM OR BARSTO BARRELS WE RECCOMEND USING THE SPRING THAT CAME WITH THE GUN WILL WORK WITH ZR TACTICAL RECOIL SPRING WE RECCOMEND SURPASSING THE 500 ROUND BREAK IN BEFORE INSTALLING THE COMP Coated with a black anodized finish or Cerakote finish Blems are cosmetic ONLY. They will function as normal AMMO DISCLAIMER: We DO NOT recommend using plated bi-metal or frangible ammo in ANY of our compensators. Doing so will void the warranty and we will not cover or replace the comp if there are any damages. Package Contents: Herrington Arms HCPDPXL Walther PDP Compensator 5/64 Allen key Steel replacement 8-32 set screw What firearm models does the manufacturer say Herrington Arms HCPDPXL Walther PDP Compensator is compatible with? The manufacturer says that Herrington Arms HCPDPXL Walther PDP Compensator is compatible with Walther PDPHerrington Arms HCPDPXL-BL: HCPDPXL Walther PDP Compensator Black