To increase the efficiency of the gun it is possible to reduce the diameter of the barrel to 9 mm under the harpoon 8 mm, but there is a problem with the piston stopping without damaging it! I solved this problem with the inserts in the piston damper together with the taper of the harpoon shank. The idea was developed under the valve gun with a light plastic piston.
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IMG_1705 - копия.JPG158.8 KB · Views: 196
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