Take
Aguila Blanca's wise advice.
Read and understand the rental agreement/contract
prior to signing. If no mention of firearms, you are good to go as you are only held to standards of which are in the contract you signed.
If guns aren't mentioned in the lease agreement, , asking further questions is just poking the hornets nest with a stick.
If there's a 'no guns policy', look elsewhere for an apartment...and please inform apartment owner/manager as to the reason.