Forward Controls Design Leupold Deltapoint Pro Vortex Defender New Venom Sights Adapter Plate Glock Gen 6 ORS Black OPF-G6 DPP. Glock Gen 6 ORS uses a polymer insert in leu of an adapter plate. OPF-G6 DPP does not. The elasticity meant to provide upward tension from its elasticity also applies to the lugs on the insert. Forward Controls Design plates have never used or relied on upward tension to keep the plate-to-slide screws from loosening we successfully use other means for the same end. With MOS plate-to-slide screws are separate from sight-to-plate. With Gen 6 ORS it's an insert with lugs screws go through the RMR and DPP and directly thread into the slide. Forward Controls Design doesn't want lugs to have elasticity or give when that happens the load is transferred to the screws their plate is specifically designed to remove the load transfer to plate-to slide screws. OPF-G6 DPP has four lugs to support DPP's four lug holes. All OPF-G6 plates are milled in 17-4 stainless steel. 17-4 stainless is an option we've made available on many of our Gen 5 MOS plates for MIL and LE customers it's standard on FCD Gen 6 ORS compatible plates. We don't believe aluminum is a suitable material for anything that can experience up to 1800G in recoil especially for sights like P2 and MSP that use a cross bolt. A 1.74oz DPP weighs 163lb in 1500G of recoil. Will 7075 hold up and to a lesser degree will the softer 6061 hold up? Forward Controls Design's not taking chances with aluminum. 17-4 SS is more expensive to source and time consuming to machine Forward Controls Design way has always been about the best we can muster not the cheapest. Gen 6 ORS pocket has a spindle shaped cavity/depression designed to prevent the plates from rotating shifting longitudinally and laterally. There is also a small 45 degrees rear locking tab to keep the rear of the plate down. All OPF-G6 plates have a bottom contoured to fit and fill out the spindle cavity they also have a small relief in the rear to make use and engage the ORS pocket's rear locking tab. When installing OPF-G6 plates the rear of the plate must be inserted into the rear ORS pocket at an angle the front of the plate then can be rotated down into the pocket the same way factory polymer inserts are installed. Glock Gen 6 ORS provides a means to secure the plate in the ORS slide OPF-G6 DPP plates take full advantage of the tools Glock provides same reason it has 4 lug lugs not just 2. OPF-G6 DPP does not ship with sight-to-slide screws as they can vary a great deal and ship with the sights. Leupold DPP ships with M4 0.7 x 15.8mm screws that are too long for other DPP footprint compatible sights torque value may differ as well for instance. Install the sight using the M4 screws that came with the sight and use the sight manufacturer's recommended torque value. Glock Gen 6 ORS has four tapped holes the two farthest apart smaller screw holes are 6-32 for RMR compatible sights the two larger holes closer together are M4 for DPP compatible sights. For DPP the torque value is 25 in lb. If you do not have a Leupold Delta Point Pro do not use the M4 0.7 x 15.8 screws nor the Leupold recommended torque value for DPP. Regarding construction tolerances and material our position is rather cut and dry and consistent: no compromises. Forward Controls Design is aware of the harsh conditions in which their plates have been and are expected to be used that knowledge reinforces Forward Controls Design choice of material. OPF-G6 tolerances are tighter than the ORS pocket and "good enough" they're designed and made for harsh demands and hard use. Specifications for Forward Controls Design Leupold Delta Point Pro Vortex Defender New Venom Sights Adapter Plate: Manufacturer: Forward Controls Design Red Dot Sights-Footprint: Deltapoint Pro Fabric/Material: 17-4 Stainless Steel Color: Black Finish: Nitride Package Contents: Forward Controls Design Leupold Delta Point Pro Vortex Defender New Venom Sights Adapter Plate 1x VC3 Packet (Threadlocker) Forward Controls Design OPF-G6 DPP: Leupold Deltapoint Pro Vortex Defender New Venom Sights Adapter Plate Glock Gen 6 ORS Black