Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good snap caps, not perfect

First of all, in case anyone doesn't know, after each pull of the trigger, the slide on your semi-auto will need to be racked to discharge the "spent" snap cap out the side and load the next one (and reset the trigger). I have no problem with that. What I do have a problem with is, while I can't speak for the other calibers, the 9mm I bought are actually slightly shorter than my real 9x19 cartridges. Whether that will cause a problem when I try mixing with real ammo (to detect my shot flinch) remains to be seen. Also, when stacked against one another in the magazine, they are rather high in friction, not smooth like between 2 brass casings. I'm not sure if that contributed to a jam I had between shots. Lastly, why are these things like $12 for 5??