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I would also recommend putting your printed firearm in a vice grip on the ground, and pulling the trigger using string from behind cover for the first mag, to make sure everything is structurally sound and assembled correctly. The STL File Collection V1 ( http://guns.i2p/index.php?topic=9.msg16 ) contains many different firearm designs and variations, and each of the firearms includes it's respective guides on assembly, and READMEs full of recommended information.