Revolvers with few/no advanced parts (meaning especially: electronics) shouldbe relatively safe. That's the whole reason they still exist, after all: rugged durability.
But I do mean, NO ELECTRONICS. No smartlinks, no laser sights, no fancy-schmancy nonsense. If it involves more than two moving parts, don't get it.
Melee hardening, personalised grip, metahuman adjustment of course: all good.