I like the Tipton snap caps a bit better than the A-zoom. The rims of the aluminum A-zoom cases kept breaking on me long before the polymer plug ever wore out. The Tipton snap caps have brass rims that seem to hold up better. I haven't had the springs get stuck on the Tiptons, but I do find that the brass primer eventually gets so indented that it really isn't cushioning the blow of the firing pin, though that happens to all snap caps eventually. I also like the Tipton because they're easier for me to find (bright red) when I am doing malfunction drills and they get ejected into the lost corner of my basement that never appears at any other time.
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