Hello everyone, I’m new to the forum, but have a question. I recently acquired a relatively unused MAK (seller said he put a few hundred rounds through it and rifling checks out) I then sent it to an AK builder (meridian ordnance) for headspace/rivet inspection. Everything checked out, however after about 100 rounds I noticed some odd wear on the trunnion, it seems to be wearing quite a bit, almost a “step” forming, however I could have not noticed it when I first bought it as I was new to AKs. Could use your opinion, is it normal? Thanks!