Interesting how the ETM mags have a spacer inside to seat the 9mm catridge a good distance forward compared to the standard stock magazine. Granted I put 500rds through my DW stock mags without issue. I’m sure this is to compensate for the shorter round vs 45. I’ve heard a lot of good things about the mags, minus how expensive they are. Don’t plan to stock pile them but do want the best or one of the top magazines that is for carry. Running rounds 501-1,000 through my new Valkyrie this weekend (ETM mags this time). Also pushed my sight over today and hopefully my windage will be corrected too. Cheers.