I need to pick up some magazines for my M2. I see both 7 round and 10 round Marlin mags being offered on eBay. I looks like these magazines have a red (or maybe orange) plastic follower, and some are advertised as being nickel plated. My questions for those more experienced here is how do these magazines function, compared to the original ones as supplied from the factory when these guns were new? Is there a source for the original style mags? Also, are there any higher capacity ones being made? If there are others being made what are the best/preferred for use in the M2's?