The LT111 OBR (Optimized Battle Rifle) QD Scope Mount was designed specifically for the OBR, available in 34mm or 30mm rings. The height is set for 1.535" above the rail, for perfect alignment with weapon-mounted clip-on night vision devices. There is zero built-in cant to ensure perfect centerline alignment (the OBR rifle has 20 MOA built-in to the upper rail). The LT-111 will also accommodate the US Optics T-Pal with it's larger turret body. The generous 2.9" ring spacing accommodates large turret blocks with ease.