SetBack™ 3” Cantilever Extension Mount

The GPO SetBack™ 3” Cantilever Extension Mount was developed specifically for today’s ultra-compact tactical optics. While compact scopes offer significant advantages in weight, balance, and handling, their shorter main tube length often limits mounting flexibility and can place the optic too far forward for proper eye relief. The SetBack™ solves this problem by moving the scope mounting position up to 3 inches rearward, allowing shooters to achieve a full field of view and a comfortable shooting position without compromising rail engagement or mounting security. Precision machined from a single billet of aircraft-grade aluminum, this one-piece mount delivers exceptional rigidity, precise ring alignment, and dependable return-to-zero performance under heavy recoil and demanding field conditions. Designed for riflescopes with a 30mm main tube, the SetBack™ features four hardened steel Allen-head cross-bolts that provide a secure, repeatable attachment to any Mil-Std 1913 Picatinny rail. Developed as the ideal mounting solution for the GPO Compact Tactical riflescope series, the SetBack™ ensures your optic sits exactly where it should—closer to your eye and ready for maximum performance.