NcSTAR AR-15 Weaver Riser Short Mount, 3/4-Inch This Compact 3/4" Riser will allow you mount certain low profile NcSTAR & VISM Dot Optics on AR-15 Flat Top receivers at the proper height to co-witness the Dot Optic with your Iron Sights. This Compact Mount will allow a more comfortable and natural ch Compatible with NcSTAR & VISM Dot Optics: DGAB, DDAB, DDAC, DDAS, VDGRLB Two Allen head bolts secure this 3/4" Rise to weaver style & Picatinny rails Construction: Hard Anodized Aluminum This Compact Mount will allow a more comfortable and natural cheek rest on your AR-15 stock with these low profile Dot Optics Compatible with NcStar & VISM Dot Optics: DGAB, DDAB, DDAC, DDAS, VDGRLB Two Allen head bolts secure this 3/4" Rise to weaver style & Picatinny rails Construction: Hard Anodized Aluminum