I have no shotguns and want/need one. Dunhams has this 870 for $349.99 http://www.remington.com/products/firearms/shotguns/model-870/model-870-express-tactical.aspx It really close to that except no rail and it has the stock/pistol grip combo. My question is how much will I lose by having the 18 1/2 inch barrel? I know it will be better if I have to use it in the house, but will it still be ok for shooting clays for fun with my buddy? Will I need to change anything to shoot slugs or rifled slugs? Also is $349 a decent price?