The 500s and 870s are the two easiest to find parts for to convert into a home defense gun as far as finding and options. If a company makes a aftermarket shotgun part it is for one of those two guns. As for reliability both are exceptional! You can't go wrong with either.
I am considering on building a custom mosin. I am interested in some opinions and advise on what parts and companies to go with on things such as stocks and barrels. My goal is to improve on accuracy As much as possible so any input will be very much appreciated. Any info on how to or what to do...