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This is my second attempt at making a potato gun. It's actually a rebuild of the first. If you notice I have added more chamber space, the chamber for this model is around 12 inches long. I replaced the old coupler with an SCH-40 coupler as well as adding another bushing and a second SCH-40 coupler. Also notice how the old drainage plug holder is gone and there's a "straightwall" drain plug holder. I'd reccomend only using a straightwall adapter, it's a nasty weak point if you use the other kind.