The ATI Shotforce PG is a pistol-grip buttstock for pump shotguns. It fits the Maverick 88, Mossberg 500/535/590/835, Remington 870, American Tactical MB3 and Winchester 1200/1300 in 12 gauge, and the same models in 20 gauge as a proud fit. Adapters for every supported model come in the box. The stock has a 14" length of pull and an X Series recoil-reducing butt pad to take the edge off heavy 12-gauge loads. The slim, non-slip pistol grip gives you a firm hold for working the pump, and the stock mounts with your factory stock bolt, so there is no extra hardware to source. Features: Fits Maverick 88, Mossberg 500/535/590/835, Remington 870, American Tactical MB3, Winchester 1200/1300 12 gauge; 20 gauge proud fit 14" length of pull X Series recoil-reducing butt pad Slim ergonomic design with non-slip pistol grip Uses the factory stock bolt; adapters included Swivel stud sling attachment Scratchproof and weatherproof Made in the USA On 20-gauge receivers the stock sits slightly proud of the receiver. That is expected and does not affect function. Pick the adapter for your model, tighten the stock bolt fully, and check for wobble before you fire.