I have a saiga and would like to put a russian type scope on it. I'm a lefty and see that these scopes are mounted on the right side of the weapon. Are these scopes designed so the the scope tube is center line over the Barrel? I just don't want to waste my money. Also what scope model sits lowest to the stock? I see alot of these scopes the way there mounted there is no way to get a good cheek weld to the stock? Thanks.