You’d think that all snap caps are created equal.
NO.
I bought some plastic snap caps called Dummy Rounds from Amazon maybe a month ago. I had no snap caps in 7.62×39 and wanted to test out some Croatian mags that I thought were misfeeding. I bought the Dummy Rounds (5 rounds).
Well, while they served their purpose (I was able to test the Croatian mags with them), they are NOT durable. I racked all 5 rounds through 4 of those mags, and ran each mag through two firearms (an AK rifle and an AK pistol). These rounds are chipped at the back, where the extractor normally latches onto the back lip of the cartridge. We’re talking big chips.
If you’re going to buy plastic snap caps, at least ensure they’re metal where the extractor makes contact with them.
I ended up buying another set (of 5) from Vector Suppliers. These are metal with rubber where the primer would be (to lessen firing pin wear/damage). I haven’t used them yet but I’m almost certain they’ll be better than the plastic ones.