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need help changing 500a mossberg to house gun
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You should start a new thread, but all you need is a short barrel. Some would say that a 28" barrel is good enough.
http://www.ebay.com/itm/Mossberg-900...item48480b7c42
If you want all that other stuff (light, pistol grip stock, fancy sights, sidesaddle, sling) that is up to you but many find that cool looking stuff is not needed.