I have a lefty Tristar Viper G3 in 12g, it hasn’t missed a beat. The only complaint I have is lack of aftermarket accessories. Unfortunately, they don’t make it in 20g.

 

Benelli just released the super black eagle 3 in left handed 20ga at SHOT show.

I would expect it to hit stores well before October.

 

Read this post I made on L handed youth shotguns:

https://www.duckhuntingchat.com/posts/8973850/

 

This is easily answered by a guy that hunts with an O/U.

 

Yea, still an option. He's gonna be 8, so worried about recoil. Planning on auto and only letting him load one shell for couple years. Might look at 28 gauge O/U, but don't wanna pay that much for ammo.

 

There are more guns that have a reversible safety than ejection port on the dubiously correct side.

My experiences around numbers of youth make me like pumps and break actions. Even with one child I want it broken open between times if we're on the move. Being stationary is less a deal because you can keep an eye on just one kid if you're not moving around. I wouldn't consider an auto unless all use was stationary.

Mossberg sells a pump that is light and short enough that he'll be able to swing it from a proper weight forward stance. Light and short enough is around 5.5# and 24". You can find a single barrel in just about any configuration. I don't know of a LH O/U or SxS that is light and short enough.

Spend the rest of the budget on cases of 3/4oz lead loads for practice and light TSS loads for ducks. When you're looking at light TSS duck loads you may start thinking about a 28ga or .410 single barrel just for ducks which then leads back to whether you can afford plenty of 28ga practice loads.