OK....You may carry any way you wish....EXCEPT.... during the actual Machinegun Shoots. All weapons must be cleared and aplastic tie down inserted to disable weapons. This includes ALL weapons....rifle, shotgun, bazookas....etc. It's a safety thing and very few people object.
IF you go any other time, no LOADED weapons are allowed in the store. You are NOT checked (frisked) for CC weapons at any time including the MG Shoots. If you do CC, and are seen, you will have your weapon cleared and tied down (During MG shoot only).
LEOs are exempt from tie downs and/or unloading personal carryweapons if they wear and show badge.
Edited to clarify CC.