If you want some great magazines that don't cost much and you have some spare time, you can modify the Belgian Vigneron 32-round magazines quite easily. I use an angle grinder with 120 grit sand disc to hit the front, rear and sides of the magazine until smooth. I would recommend using a set of calipers to get a starting point and go from there. Once done with reducing the size of the portion of the magazine that inserts into the well, you will have to open the front portion of the feed lips just slightly I use a cheap Harbor Freight metal punch/chisel that's tapered. It's the larger to medium-sized unit and just tap it in slight and it will allow the bullets to feed at the proper angle. I have approximately eight MP-40's and the parts that we go through on a regular basis include the extractor, bolt handle coming off and rarely the ejector wears out. We have lost two sets of the telescoping recoil spring but I blame that on lack of changing out the recoil springs on a timely basis. V/R Ron