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Editor’s Note: The Mossberg 590M Shockwave brought high capacity to short shotguns. Even though it only has an overall length of 26.3 inches, the 590M Shockwave boasts an impressive capacity of 10+1 thanks to its magazine design. Aside from the magazine, it has all the standard 590 features, including twin action bars and an ambidextrous tang safety.  Everything is rounded out with a 15-inch heavy-walled barrel. The 590M Shockwave is great for those that want to cut down on length without sacrificing capacity.