Not for me, unreliable - Mean Arms 9mm Ejectored EndoMag - 3 Pack

Trying to load over 20 rounds in these mags is a real pain in the thumbs and nobody makes a loader for them. Tough to get through a full mag without having a FTF using 115gr FMJ. Using an AR stoner 10.5 upper. Have another AR9 build with an AR Stoner upper but with guntec mag adapter and Colt mags and haven't had any kind of jam yet, very reliable. Noticed the feed ramp of the guntec is much higher than the feed ramp on the endomag. Endomag might work better with uppers that have more of a bevel at the edge of the chamber. Definitely don't like the fact that you need to have an endomag inserted to eject a round. Rather lose some versatility than have a safety issue.