The Kinetic Develoment Group BOM Multi Height Optics Mount was designed to be the Best Optic Mount. A rugged, adjustable-height hard mount featuring a steel clamp and an interchangeable top plate system for ultimate modularity. Your red dot shouldn't move. Ever. The KDG BOM Series is a hard mount built for shooters who are done worrying about zero shift. Designed as a rugged alternative to the Quick Detach Sidelok line, the BOM swaps quick-detach convenience for a permanent, bolt-on lockup - and it doesn't budge. The KDG BOM Series locks your red dot down and adapts when your mission changes. Built right, built once. FeaturesAdjustable Optic Heights: Run it stock at 1.57" or drop in the included lift block for 1.93" - the height you want when you're running night vision, a gas mask, or just a more heads-up posture.Interchangeable Top Plates: This one ships with the Acro plate. Switch optics later and you don't need a new base - just grab the standalone top plate for DPP, ACRO, COA, ...