i am trying to order a EGW 20 moa base for my model 10fcp...i already have burris xtr low rings and my millet scope is 50mm so therefore i need the egw to raise it off the barrel a lil i guess..anyways..swfa has alot of different ones when u type in egw...ugh..which one do i need?? i know im stupid in the boltgun category..please someone steer me straight