The Calculated Kinetics Adapter Plate is precision-machined in the USA from 6061 aluminum with a durable hard anodized black finish designed specifically for GLOCK 43X/48 MOS pistols.Calculated Kinetics Adapter Plate for GLOCK 43X/48 MOSHolosun K Footprint compatibilityUSA-made 6061 aluminum constructionHard anodized black finish for lifetime durabilityFits Modified RMSc optics (407k/507k/EPS Carry)Includes mounting hardware Vibratite and installation instructionsBuilt for professional and recreational shooters who demand reliable optic mounting solutions with superior craftsmanship and long-lasting performance on their GLOCK MOS platform.