Thedude's point is a very good one. Also, while the US is having school shootings more and more frequently, the rest of the world also has problems with that depending on the region at even worse frequency.
To be honest though, I think they ran their course with gun gags anyway. Oh, it makes a hole in the character, or it gets clogged and explodes, or the bullets look like beans and a bean gag happens. Giving him new weapons actually makes for more fun variety in the slapstick.
In my universe (Splitting Image doesn't have gunpowder for unrelated reasons, and projectiles are more like arrows or spells for convenience), I try to keep it to "stylish" use of firearms at the most. Never liked modern guns, still don't, and I'd rather have weaponry that compliments a character design rather than one-size-fits-all. Very few characters in my projects use guns at all, and the ones that do usually have muskets, flintlocks, blunderbusses or other things that I can give magical rounds to for flashy displays, that are still not efficient enough to be overpowered. Rule of cool, even before it gets into personal issues.
On the personal issue side, there's lore compliments to show that the universe's education system teaches a permanent barrier spell very early on everyone's life, and that invisible barrier can deflect gunshots at least once(and as a bonus, prevents characters from being killed instantly, so even the godlike characters have to put in effort). I never liked the trope where a non-magical character pulls a pistol and just ends the conflict and it kinda reinforces why I don't like 'em.
