Im in the same boat. Im definitly going to be opening mine up becasue ive already ran into problems. The side with the pin probably wont be messed with much, but the other side and near the follower need some help. I find that on the first shell in an empty magazine its getting stuck almost every time right on the lip. Sometimes you can force the shell past that spot, sometimes not, and thats a big problem for a blind reload on a course of fire.