The two I've got will misfire from time to time in D/A but it's only with reloads. So far with factory ammo, or even commercial reloads, now that I think about it, they've worked fine. I don't know if my primers (CCI's) are harder than other brands. It may just be this batch of primers, they will misfire with other guns, once in a while, also. When I shoot this batch up, I plan to switch to another brand. It's plinking ammo, so I don't fret about it much.