I don't know what generation the stock was- it was whatever Badger Guns had in their inventory. Unfortunately, I returned it already, so I don't have that information. I went through more than 450 rounds over four days, including over 100 rounds of slug and buck. That is standard for that...
I knew nothing about shotguns either and took the FrontSight 4-day tactical shotgun class. The best advice I can offer is to not worry about how many rounds your gun holds and leave the factory stock on there. The more rounds in the tube, the heavier your gun will be and the less-accurate you...