Advanced Technology Inc. is now producing a new top-folding stock for 12-gauge Mossberg 500, Remington 870, Winchester 1200/1300, and Maverick 88 pump shotguns. The stock is ergonomically designed with an integrated pistol grip and top-folding buttstock, and a quick release button that locks the arm securely into the open or closed position. It installs without gunsmithing and folds to 29 inches (with 18.5-inch barrel length). An optional five round shell holder is sold separately.