“This is a complete PLUS-PLUS add-on to the SB Tactical stock. There were some earlier reviews that spoke of a 'wobble', then a fix was announced(!), and mine...is rock solid/ locks tight!! Install took all of less than 1 minute. I would say it's more than an optional 'accessory' 'n more a practical 'necessity' to go w/ SB's Charger tactical stock. T/a a 'new' gun!!”