I have a M43C 22LR that I bought new last month. It has about 300 rounds through it. Everything looks real nice, and I really enjoy shooting it at the range. Except for one problem. I have trouble ejecting the empty cases. I have been using 40 gr CCI Velocitators. I have to use considerable force on the rod to clear the chambers, and a few times have had to use some light tapping with a mallet. I am wondering if this is usual with Aluminum cylinders? I haven't had this sort of problem with steel cylinders. Would it be a good idea to polish the chambers with metal polish on a patch. I would be doing this by hand, no power tools.

Best,
Rick