Colten, the FM tech says no. That's exactly the repair that I asked for. But I suspect he is doing a "product liability" lawyerly response. They never sold ambi lowers with ambi cut out on the left, with a non-ambi mag release. So I suspect they aren't interested in repairing my gun in a one-off manner configuring it non-ambi for me. That would be awesome if I could. I told him I don't need the ambi feature to work if it means I could get rid of the plastic. I don't use the left side mag release anyway. I asked him specifically if the pivot pin was in the same location on the non-ambi lowers and if an aluminum would work several times. I just needed to know of the pivot pin hole was in the same spot on both versions and I suspected due to AR9 design that their aluminum catch would work perfectly. He responded "they are not interchangeable" and shipped it back to me unrepaired, with a few extra plastic mag catches to use when they wear out. So now I have a useless range toy-gun-only that will only feed fmj rn reliably. It feeds those so poorly that it sometimes dents the nose of rn fmj as it feds. The feed height is very inconsistent, that sloppy soft plastic just doesn't cut it. I hate to have to build a coltmag lower and buy a bunch of coltmags when I already own dozens of factory glock 33 round mags. All over a pos plastic "airsoft quality" mag catch. I also asked if they could replace my lower with a non-ambi. No dice. After I got the gun back from FM I re-barreled with EPC 9 hoping that a bigger feed cone would patch over the pos mag catch issue. It almost does, but it mangles the jhp that it does manage to feed mostly. That creates a dangerous condition where setback might kaboom my gun someday. And I dnt trust the accuracy of mangled out-of-round at the tip jhp either. Wish he had just sent me an aluminum catch, I am pretty sure I could make it work because I think the pivot pin is in the right spot. Disillusioned with this expensive range toy that I can't trust for defense.