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Paul, you will likely need a different/longer barrel depending on you end tube design : https://www.youtube.com/watch?v=GTxuqgJfPgM

For ten rounds id go with a tactical conversion mag kit for the mossberg 500. Available with a 10rd box mag or a 10 round drum mag. In stock and ready to ship here https://www.opticsplanet.com/adaptive-tactical-venom-shotgun-magazine-conversion-kit-jvydn.html