Different mechanism for sure- however- I had a Mini-14 all tricked out for accuracy "except" that first round loaded by charging it from the magazine went high & right 5", then the rest (which loaded by the gas action) all went where they were supposed to! ha
I also have had new scopes that flaked out and a couple more that moved back and forth several inches, 2-3 tot he left, the next 2-3 to the right, etc. I think anything man made is subject to screwing up royally, ha. Keep us posted though as to what you do, but take some Tums, and count to ten before doing anything rash to it! smile