Vortex Standard 30mm Rifle Scope High Rings - Picatinny / Weaver Mount - Set Of 2 - 30MRNG-H. 30MRNG-H. Rings. The Vortex Standard 30mm Medium Rifle Scope rings mount on Picatinny or Weaver type rails positioning the center of the riflescope tube at a height of 1. 22 inches (31mm) from the base rail surface. Made from aircraft-grade 6061-T6 aluminum for optimum strength.