Mossberg 500 Bullpup stock. Excellent new in the box condition. Black polymer construction. Includes ribbed forearm, complete stock and trigger assembly, screws, tools, manual and maker's box. Note on the manual indicates it fits the Mossberg 500 shotgun with plain barrel and bed sight. It will not fit on guns with a 3 1/2" receiver, ribbed barrel or the 18 1/2" barrel with rifle sights.