Mossburg 500 / 590 , Maverick 88 , Remington 870 , etc. ... Which models / series do you find offer the widest selection of after market parts , accessories , add ons , etc. to turn a stock shotgun into a tactical shotgun ? I'm thinking of a lower to mid priced 12 gauge pump with high reliability that you could turn into a 12 gauge "project gun" to have fun with but also primarily be used for HD but also switch to a vent rib 28" field model for sporting clays or hunting . *My short list are Mossburg 500 combo security / field and the same in a Maverick 88 , but there could be others - your thoughts and experiences ?