I have a colt 6920 and I'm putting a leupold 2-7x33 scope on it. I'm at a stand still on the scope rings. I'm going to have to take my rear flip up sight off most likely. I'm not sure what height I need on the rings to clear the A2 front post sight. Don't want to spend a bunch of money on the rings or mount but want something that won't move and hold zero. Was looking at the Blackhawks at Walmart but not sure about height. All options will be appreciated.