The versatile telescoping stock adapter system can be fitted with a standard AR-15 ... Adapts AR-15 style buttstocks and pistol grips for use with Remington 870, Mossberg 500/590 and Beretta ...

Mossberg 500 mag tube accessory mount from Choate Machine and Tool. The Night Manager Accessory Mount for Mossberg shotguns is available for the model 500 and Maverick model 88.