I am new to shotguns and would appreciate some advice. My goal is to have a 12 gauge shotgun for protection while hiking. I'm thinking something like a modified Remington 870? I would like to put a collapsible or telescoping stock with a pistol grip on it and the shortest legal barrel for slugs yet able to carry a sufficient number of shells. Additionally, I would like a sling or holster with quick draw access. I'm not looking for the most expensive gear either. What would be a good reliable gun, stock, barrel and sling for this? Thanks for your help.