The Herrington Arms HCRXM is designed to fit the contour of the Ruger RXM slide. We engineered the comp with side fins so it has a seamless design with the RXM slide. The HCRXM 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. When testing this compensator, we have data showing it mitigating 28% muzzle flip reduction depending on what 9mm load is used.    Specifications Material : 7075 Aluminum Finish : Black Anodized, Sniper Green Cerakote, Sniper Grey Cerakote, and FDE Cerakote Compatibility : Ruger RXM with factory or aftermarket 1/2-28 threaded barrel Included : 5/64 Allen key - Steel replacement 8-32 set screw Length : .95in long Holster Compatibility : Will fit in most open bottom holsters. We use Sierra Defense, Tier 1 Concealed, and Safariland. Highlights Designed to work with most 1/2-28 threaded 9mm barrels.  Made from USA-sourced 7075 aluminum. Designed, assembled, and machined in the USA. Will fit in most open bottom holsters. We use Sierra Defense, Tier 1 Concealed, and Safariland. NOT COMPATIBLE WITH BAR-STO, KKM, OR EFK BARRELS! 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 our compensators. Doing so will void the warranty and we will not cover or replace the comp if there are any damages.   INSTALLATION INSTRUCTIONS Make sure all threads are clean of grease, carbon, and loctite. Wipe the threads down till they're clean. If the threads are not cleaned, the loctite will not set properly. Only use loctite 243 on the barrel AND set screw threads. Some versions of the blue Loctite are not very strong and will not hold up. Feel free to use a generous amount. Torque the set screws to no more than 18in/lbs for 8-32 set screws and no more than 11in/lbs for 6-32 set screws.  Allow the loctite to set for 24-48 hours before using. Please be sure that the compensator is not touching the slide, frame, or guide rod as that can cause cycling issues.