Sounds like there is an obstruction between the barrel and the firing chamber.try cleaning the barrel and the chamber. If this does not work make sure when you place the barrel in the firing position that everything is lining up correctly allowing for an efficient release of air from the chamber.
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Sounds like there is an obstruction between the barrel and the firing chamber.try cleaning the barrel and the chamber. If this does not work make sure when you place the barrel in the firing position that everything is lining up correctly allowing for an efficient release of air from the chamber.