The real quick and easy fix with these ACM models is to use Maruzen mags. Though most unsporting that the ACM is a total Maruzen rip-off, it does make parts very accessible. Indeed, my ACM is basically half Maruzen now with the magazine, grips, springs, outer/inner barrel, -except for one part (the Guarder enhanced loading nozzle). I had hoped the loading nozzle replacement would stop the double feeds though it didn't really make that much difference in truth (reducing the problem to maybe 1 double feed out every 40 shots). The mags switch was an instant transformation however. That said, I am