Hi guys, I am new to AR's and I am thinking about putting together a parts bin incase I need to do some basic repairs. I would like to be prepared and have parts on hand instead of having to hunt something down and then wait for it when I need something? I am considering buying a extra lower parts kit, is there any other parts I should accumilate in case of a breakage of some kind? Would it be a good idea to have a whole new extra BCG? And what tools should I pick up. I was thinking about buying a Leatherman MUT to go with my AR, anyone use one in the field? I have been looking for a set of punches and the only decent set I have found is at Sportsmans Warehous for $40. Are there any other good sets out there in that price range? Any help would be greatly appricated thanks.