Do the rules say you can't use a strobe weapon light? Do the rules say you can't shoot prone? Do the rules say you can't shoot with an upside down grip? Do the rules say you can't dual wield? Do the rules say you can't wear a scary clown mask while shooting? Do the rules say you can't shoot .50 BMG? I'm sure there are a lot of things not in print they will enforce verbally when necessary. Sounds like the ROs need these to hand out:
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Are you an RO sir.....