SR is unbalanced , This is why : Cops can easily end the SR by sniping and killing criminals who are on the roof . Then they can camp inside making it impossible for criminals to kill them . You may ask why don't criminals camp inside ? It's very easy for a cop to rush inside and hit around with the nightstick and send them instantly to the jail , because the inside of the store is small . ::: ::: So my suggestion is making the glass bullet-penetrable , Cops can still hide inside but this would be more balanced .