How does this effect Night Fision customers? There is no impact on the sight dovetails, but the plate you select will change—if you have an MOSK or MOS-K marked 43, 43x, or 48 and you want to mount an optic with a K footprint, you don’t need a plate! You can skip that step and mount your optic as directed to your pistol. If you have an older model with the 4 recoil bosses of the RMSc footprint, and you want to mount a Holosun K footprint optic, you’ll need a plate. Because the plate thickness is not substantial, you can select a slightly lower blade height for your Holosun K optic (220-227) than our recommended 260-267 to really tuck your co-witnessing sights as low in your optic window as possible. If it isn’t a Holosun K, stick with our recommended 260-267 for the battery deck of most other optics that share that footprint.