I had simular jam problems with my DWM, Winchester ammo worked best. I bought new mags, old mags, 115gr and 124gr ammo of many brands, but couldn't make the gun work right. Jams were always more frequent when it was cold outside. I fixed the problem with a wolff 36lb mainspring. I don't think this gun has failed me since. If the weapon is in good shape you might give it a try.
Good luck, Stevie.
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