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  1. J

    gamo g-magnum 1250 IGT MACH 1 transfer port size

    thank u tom. U have a great knowledge on it. Thanks for sharing.
  2. J

    gamo g-magnum 1250 IGT MACH 1 transfer port size

    There ate two things u have to do to achieve original 45 joules. 1. widen the t.p.hole 3.5 to 3.8 mm. 2. Surface of the breach seal should be flat as in original. But limited version has a wide carved hole in which the 2.x mm t.p.hole is set. The carved gap should be filled and then work on...