The MSR Flat Top Rings are precision CNC machined from aircraft grade aluminum for reduced weight. These rings are designed after our X-SKEL Mount and feature a steel cross bolt for superior absorption and positive lock for guaranteed return to zero. The MSR Flat Top Rings are available in a quick detachable wingnut version for fast removal and installation or a tactical nut for a more permanent solution. Both of these features allow the use of multiple optics without the loss of zero.