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secondary HD gun,Protect family in a mid to long term survival situation..
as soon as you throw that out there that becomes #1 in my book. If you plan on blow out do you want a full size spare or a dougnut tire? As far as the three parts you listed a dust cover is part of the system and you do need it, chrome plating/lining in this day and age personal preference but I do go with nickel-boron BCG when I can