Weaver Thumbnut Integral 30mm Mount

The Thumb-Nut Special Purpose Rifle (SPR) Optics Mount has been designed for AR-style rifles. Their specialized, sleek design delivers optimal height with a forward cantilever for AR platform rifles. Constructed of lightweight, strong, aircraft-grade, 6061-T6 aluminum with a black matte anodized finish. Available for 1" or 30mm optics. Features Thumb-nut bolts for turning leverage Optimal height and forward cantilever for AR platform rifles Sleek design for low-profile mounting Four-hole ring design for added gripping power Rugged cross-lock base design for ultimate gripping strength 2 5/8" between the rings