The Trijicon RMRcc 3.25 MOA is the slim-line cousin of the RMR - engineered specifically for subcompact and slim pistols where a full-size RMR is too wide. The RMRcc's narrower housing fits cleanly on the Glock 43X, Glock 48, Sig P365 family, and other slim micro-compacts without overhanging the slide. Specs: Reticle: 3.25 MOA red dot Housing: 7075-T6 aluminum, hardcoat anodized black Window: 17mm x 16mm (smaller than full RMR's 17mm round) Illumination: 8 brightness + 2 night-vision compatible (manual) Adjustment: 1 MOA windage and elevation Battery: CR2032, side-loading Battery life: up to 3 years at brightness 4 Weight: 1.0 oz Footprint: Trijicon RMRcc (NOT compatible with standard RMR cuts) Waterproof: IPX7 Important footprint note: The RMRcc uses its OWN footprint - it does NOT mount on standard Trijicon RMR cuts. Verify your slide is cut for RMRcc or use an RMRcc-specific adapter plate. The Glock 43X / 48 MOS slides ship with the RMRcc cut. Sig P365XL "Spectre" and similar carry slides also have RMRcc cuts.