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There are two main types of these chronos—barrel mounted and tripod mounted.Tripod mounted has many aficionados although imo the window for the pellet is quite small and the chances for damage are quite high.Barrel mounted ones seem much better but I’m fairly certain they can’t handle big bores or anything that has a bigger blast of air. I don’t know that I’d want to use the tripod mounted one with a big bore either though!