Optisan QRA™ (Quick Repeatable Accuracy) Gen II features a 25% reduction in weight from its predecessor QRA Gen I without sacrifice the return to zero precision. Precisely CNC machined from one-piece solid steel while maintaining an ultra light weight at only 168g a pair. Integrated recoil lug fits standard picatinny (MIL-STD-1913) or Weaver rail and ensures a positive engagement with the mounting rail.