Forward Controls Design OPF-G Trijicon RMR & SRO Mounting Plate for Glock Gen6 The OPF-G6 is a mounting plate designed to mount a Trijicon RMR or SRO on your Gen6 Glock. OPF-G6, RMR fills the gap in the front and rear of the RMR. For a RMR, a sealing plate is required. The sealing plate is not required for RMR HD, SRO and RCR. The 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. Due to Gen 6 ORS slide tolerances, a very small gap between the rear fence and the slide may be present. Both the front and rear fences of OPF-G6, RMR are cosmetic with our RMR plate design, so is the tiny gap. Glock Gen 6 ORS uses a polymer insert in leu of an adapter plate.  OPF-G6 RMR does not. The elasticity meant to provide upward tension from its elasticity also applies to the lugs on the insert, we don’t want our lugs to give way and deform under sharp impact. 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. Proudly designed and made in the USA. Note OPF-G, RMR is designed for Trijicon RMR and SRO.  If you use a Holosun and the long set of screws with OPF-G, RMR, you will risk damaging the plate.  We do not support any Holosun sights for use with OPF-G, RMR.