Designed for Compact Tactical Riflescopes Richmond, VA. (August 14th, 2026) – German Precision Optics(GPO USA) proudly announces the GPO SetbackÔ Cantilever 3” extension mount designed for compact tactical 30mm riflescopes. This design allows compact riflescopes to be mounted up to either 3” forward or rearward, depending on what the optical system requires for optimal eye […]