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by mrsteel
Sun Jan 03, 2010 5:58 pm
Forum: Pneumatic Cannons
Topic: Piston Valves Explained Visually
Replies: 177
Views: 135030

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?