AR-15s

The AR is probably the best shoulder fired weapon to buy for self defense and small game. It modularity and huge aftermarket parts supply allows for it to be updated as budget and owners techniques and skills improve. The small frame (AR15) comes many calibers which allows uppers of different calibers, barrel lengths, optics etc to be quickly swapped out for different purposes.

It is fast and light and has little recoil which equates to more comfort thus more likely to be shot and trained with especially smaller people.