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- Sun Jan 03, 2010 5:58 pm
- Forum: Pneumatic Cannons
- Topic: Piston Valves Explained Visually
- Replies: 175
- Views: 130637
im building a piston valve airgun and i want to know if the diameter of the exhaust port should be bigger or smaller than that of the barrel, whichone woold give more power to the barrel?