Personally I'd probably go for B. I love lots of mags and you got a 100+ bucks worth.
There's not that many internals that are going to wear out. They are pretty simple. If it looks decent cosmetically it's probably good to go.
Might replace the recoil spring right off but I'd probably do that for either so that's a wash.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."