I find side levers awkward to cock, and at least my fathers Diana (not sure what model) felt very heavy. Both side and under lever, by definition of being fixed barrel constraints your access to the breach for loading and cleaning. This is obviously a matter of preference as all have been successful designs. I like the ergonomics of break barrels, and my HW80 in .22 and it has been extremely effective on rabbits and squirrels. It does not take a lot to kill a rabbit, but I can't help admire how hardy squirrels are. With gas/spring airguns it's about accuracy and shot placement.
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