New Viridian RFX 35 Optic with 401mfg Optics mounting plate. Plate and optic fit all HK optic ready slides. Plate comes with all screws and Loctite needed for mounting. Mounting plates are made from 7075 aircraft alum. Black anodized See reviews. RFX 35 Optic is new with great YouTube reviews. Green dot is crisp and clear. Approx same size as the SRO and half the price. Much tighter fit than OEM plates. When you take the optic off. You will not need to re zero.