Code Description 4000GH-1.2 4000GH gun available in 1.2 mm 4000GH-1.3 4000GH gun available in 1.3 mm 4000GH-1.4 4000GH gun available in 1.4 mm 4000GH-1.6 4000GH gun available in 1.6 mm 4000GH-1.8 4000GH gun available in 1.8 mm 4000RK Repair kit for 4000GH series guns