Monstrum 7075 Series RMR 407C/507C XR Footprint Mounting Plate for Optics Ready Glock Pistols for Full Sized and Compact Gen 4/ Gen 5 MOS Version. The mount is built for use with: Gen 4/Gen 5 MOS version Glocks including G17 G19 G22 G23 G34 G40 G41 G45 and G47 NOT compatible with: Non-MOS version Glock pistols G43x/G48 Slimline MOS version Glock pistols Compatible with RMR footprint red dots only. Please refer to the compatibility chart graphic before purchasing. Includes M3 screws in multiple length for compatibility across different red dot makes and models. Recommended torque specs : 15 in/lbs. 7075 Series plates are crafted from 7075 grade aluminum. Most consumer grade gun accessories are made from 6061 aluminum. 7075 aluminum is lightweight like 6061 aluminum yet rates significantly stronger in terms of Brinell Hardness Tensile Strength and Shear Strength. All Monstrum products come with a lifetime guarantee Specifications for Monstrum 7075 Series RMR 407C/507C XR Footprint Mounting Plate for Optics Ready Glock Pistols: Manufacturer: Monstrum Red Dot Sights-Footprint: Holosun 507c Optic Cut: Glock MOS Fabric/Material: 7075 Aluminum Gun Model: Glock 27 MOS Gen 5 Glock 17L MOS Gen 5 Glock 34 MOS Gen 4 Glock 45 MOS Gen 5 Glock 26 MOS Gen 5 Glock 19 MOS Gen 4 Glock 22 Gen 5 MOS Glock 28 MOS Gen 5 Glock 42 MOS Gen 5 Glock 34 MOS Gen 5 Glock 19 MOS Gen 5 Glock 17 MOS Gen 5 Glock 17 MOS Gen 4 Glock 35 MOS Gen 4 Glock 33 MOS Gen 5 Glock 40 Gen 4 MOS Glock 44 MOS Gen 5 Glock 41 Gen 4 MOS Package Contents: Monstrum 7075 Series RMR 407C/507C XR Footprint Mounting Plate for Optics Ready Glock Pistols Monstrum ZD73R-PRO: 7075 Series RMR 407C/507C XR Footprint Mounting Plate for Optics Ready Glock Pistols for Full Sized and Compact Gen 4/ Gen 5 MOS Version Compatible with RMR/SRO Footprint Red Dots