I'd like to start him on a break-action gun for all the usual reasons, and a side by side would be great but....he's a typical 13-year old. Anything good or even interesting is going to get used pretty hard. I'd hate to do that because I won't be able to ignore it and I want this to be fun for him. O/Us are clearly more available and accordingly cheaper, but...is there a downside to starting with a single trigger O/U? After much consideration, I thinking 20-gauge (I know 12s are more available and cheaper) because this is for purely upland use. Any ideas from this wise & venerable crowd?

Oh....my default position is a pumpgun.