This mag mount is the same as the popular 5114-01, but with a 5/8x11 stud on top, instead of the quick-release adapter. The 5/8x11 stud allows the mag mount to be used with a Topcon GR-3. Leica users can also use this mount but need to add a 2080-SS stainless-steel adapter (sold separately). Owners of the SECO 5114-01 triple mag mount can purchase the 5/8x11 stud (5114-02-001) for an easy conversion.