I have two Glock 20's both 3rd gen. One is a compensated model. Ive had both for quite awhile and have shot them hundreds of times. Ive always noticed that i shoot my G20c a tad low which i just made up for in the past by aiming a little high. This morning i took both of them out and shot them at 50 yards and now with the G20c it shoots about 10 feet low at that range! Im dead on with the other one with the same ammo. This is much worse than it has been in the past and i dont know whats going on. Ive pulled it apart inspected it and all but i cant visually see anything wrong to make it that bad. Normally one would assume its me but i just dont see that being the case at this time. Anybody else ever have this problem?