Herrington Arms HC320 Sig Sauer P320 Compensator Black. It is made of high-quality 7075 aluminum and coated with either FDE Cerakote or Black Anodized finish to compliment your specific Sig P320 configuration. The HC320 will work with the stock springs provided your gun has gone through 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. Fits on 1/2-28 or M13.5x1 LH threaded barrels and most aftermarket barrels. Specifications for Herrington Arms HC320 Sig Sauer P320 Compensator: Manufacturer: Herrington Arms Fabric/Material: 7075 Aluminum Threads per Inch: 1/2x28 Gun Make: SIG Sauer Gun Model: SIG Sauer P320 Features of Herrington Arms HC320 Sig Sauer P320 Compensator 3 port design to mitigate vertical and felt recoil Will fit in most open bottom holsters. Use Sierra Defense Tier 1 Concealed and Safariland. NOT COMPATIBLE WITH BAR-STO KKM OR EFK BARRELS Works with Sig P320 9mm models With Legion models it may require a DPM spring kit to run 115 grain ammo IF YOU HAVE AN ISSUE ASSEMBLYING WITH THE NEW P320 GUIDE ROD THAT HAS THE GOLD WASHER ON THE END PLEASE SEND US AN EMAIL. WE HAVE A TECHNIQUE TO HELP ASSEMBLY. Blems are cosmetic ONLY. They will function as normal - May have nicks dings pitting machining marks chips discoloration etc. AMMO DISCLAIMER: We DO NOT recommend using plated bi-metal or frangible ammo in ANY of 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 HC320 Sig Sauer P320 Compensator 5/64 Allen key Steel replacement 8-32 set screw What firearm models does the manufacturer say Herrington Arms HC320 Sig Sauer P320 Compensator is compatible with? The manufacturer suggests that Herrington Arms HC320 Sig Sauer P320 Compensator is compatible with SIG Sauer P320Herrington Arms HC320-M13-BL: HC320 Sig Sauer P320 Compensator Black