My fairly new ruger 10 22 the back sights wont go low enough to get the iron sights sighted in, what do you all sugest?I have had this rifle for about a year and have only shot it about 150 rounds throught it, i have the see thru scope mounts on it so if some thing is close i can use iron sights, and if is out there ferther use the scope but cant get the iron sights sighted in