Dont worry about the factory choke tubes. I never noticed a difference between factory and aftermarket tubes, even though I own a few now. I use rotate my SBE II and Nova for shooting the geeses. I shoot a Kicks High Flyer (Mod Steel Ported) in my Nova, Super tight pattern with hevishot @ 45 yards. Good overall pattern with steel. Havent tried it with lead field loads yet. They dont recommend buckshot BUT if you want a home defense choke, get a skeet or IC choke. Theyll handle buck in close, and rifled slugs.
As far as recoil pads, not sure you need one. I shoot all 3 1/2 steel and will be custom loading my own 3 1/2 0000 buckshot loads. I shot one with the mercury reducer in the stock and Im not sure its worth the money.
Overall great gun, great price, and you get a moderate ohh and ahh value from the redneck hunters.
Oh yeah, the rifled slug barrel is worth every cent.