Just take out 1 firearm at a time to shoot. 

Not only shoyuld a tenant not know where you live, but I would also recommend everyone take a self defense class (you will not only learn to protect yourself, but you will be in the best physical shape of your life), get trained in firearms, and carry a gun and a knife.I do all of the bove and it has worked out well so far.

Engaging in acts of violence or threats of violence, including but not limited to the unlawful discharge of firearms, prostitution, criminal street gang activity, intimidation, or any other breach of the Lease that otherwise jeopardizes the health, safety or welfare of the Landlord, his Agents or Tenants. 

The police won't do anything about someone brandishing a firearm?

Indiana is a heavy fire arm owning state.

I own firearms, however in my SFHs I state in the lease that firearms are allowed.  

do retrieve and keep any firearms.  

High crime and illegal firearms being found in one of the houses you own is not a good sign, and will likely lead to poor financial returns for the owner = empty house for 8 months before selling it. 3) Very accurate.

Sometimes when they move out they forget about their unregistered firearms.

Especially if -- like a number of LLs -- one carries a concealed firearm?