Hi gang, I just bought this F4 177. I previously own a very old crossman pump 22 cal rifle. It's about 80 years old. Always fired with no problems. Sights never needed adjustment. But it finally started to lose power. So I purchased this F4 in it's place. I never had a 177. Or a break load. Very impressive. I am still working on sighting in the scope. Seems to be low and to the left. It might have to be shimmed. I read there is a break in period for the barrel. I can't figure that one? And why would wear on the break hinge cause the sight to go off if the scope is attached to the barrel? Your still looking down the barrel. And the scope is firmly attached. Other than that is shoots great. My arm is hurting from loading. It takes a bit of arm force to cock it.