The is no gun size limit. Keep it mind that our facility is a close quarters combat arena. A large gun will make it harder to move around and properly use. Our fps limit is 390 with .20s and 350 with .25s
The most your gun is allowed to shoot is 400 fps. As far as size i don't think it matters. But be warned it is a CQB close quarters arena. I would not recommend taking anything longer then a M16 at the most in there. But you can.
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