Yes, Thunder's rant about stuff. Not only that, but many guns have quick change springs/cylinders, or NPAS or similar valves for gas guns that allow you to change your muzzle energy on the fly. It's easy enough to chrono a gun with 0.20g or the weight they're using, and then they could alter it up and down themselves. Whatever system you have in place, make sure it's simple to understand and enforce. Spot checks are a good idea, and even a midday chrono isn't bad either. It is each players responsibility to know there gun.
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