These aluminum adapters let you connect your favorite AR style telescoping stock to your favorite pump shotgun. They accept most third-party AR-15 stocks or pistol grips. Low- and High-tube adapters can be fitted with optional side-mount Picatinny rails and accessories. Complete telescoping stock kits include stock adapter, Hogue pistol grip and push-button sling swivel. Stock kits and adapters for the Mossberg 500 will also fit Mossberg 590 shotguns. Buttstocks are the new pattern 4-position telescoping M4 SOPMOD polymer stocks. Low-tube adapters feature a lower stock elevation for use with receiver-mounted sights or no sights at all.