I own three Keltec sub2000s: 1st gen sub2000 40 cal glock gen 1. excellent, reliable great little truck gun to fold under the seat. I recently bought a sub2000 gen 2 9 mm glock and sub2000 gen 40 cal beretta for my son. we purchased mec gar magazines and pro mag hicap mags for the beretta. no problem with mec gar 10 rd mags first time thru then ammo started jamming. With promag hicap mags, we could not use them without jamming. we're using Brazer Brass rounds and i'm going to try the federal s&W ammo see if it helps but is there a reliable magazine one would recommend for the sub2000 40 S&W Beretta carbine?