Does anyone on here have a Hatsan DF-12 semi-auto shotgun? It is basically like an AR15, but 12ga. It comes with 5-round mags. I want 10-round mags. You can't find them anywhere. A suggested substitue is the MKA1919. They fit, but they are tight. Tight enough that I have to really pull hard to get the mag back out. If anyone has this issue, is there some fix (someplace that I can get away with reshaping the MKA1919 mag) so that they will come out more easily? Thanks.