Burris legendary quality continues into the XTB Xtreme Tactical Bases! These bases are machined with close tolerances from solid steel and feature an adaptable reversible front base. Xtreme Tactical Bases are crafted from solid steel and engineered for maximum mounting flexibility and minimal height and weight. Mil-spec cross slots guarantee rock-solid attachment with any and all Weaver-style Picatinny-style or mil-spec rings. Front base is reversible to provide multiple ring positions to accommodate various scope lengths.