The Calculated Kinetics Hellcat Adapter Plate provides a secure mounting solution for your Springfield Armory OSP pistol with K/RMSC footprint optics. Featuring full recoil lugs for maximum stability and hard anodized finish for durability.Calculated Kinetics Hellcat Adapter PlateFits Springfield Armory Pro OSP and RDP modelsCompatible with Holosun 407K/507K/EPS Carry/SCS Carry opticsFull recoil lugs for stable optic mountMachined in USA with hard anodized finishIncludes hardware Torx bits Vibratite and instructionsRecommended with Ameriglo SA 504 iron sights for co-witnessPerfect for upgrading your Springfield Armory Hellcat series pistol with reliable red dot optic mounting that maintains zero under recoil.