I ran the two mags through the G48 and had an failure on the second mag. Only this time it jammed on the firing pin, lol. At this point I have over 800 rounds through this gun only on this issue. I have somebody else compare the two slide releases, and they said they look the same. With the scarcity of 9mm and the high price, I think at this point I can either: A. Wait and see if shield arms will ever respond. B. Stop wasting more range time and ammo and buy a new mag release. and do a final test.