I have the tool and im 100% sure overgassing is not the issue. I actually started down to 1.2 gas setting. Rifle cycle fine recoil is pleasant its really great other than the 2 shot going at once. Got up to 1.3, same issue. Went up to 1.5 and now it wont pickup the next round but the sear does reset since it goes clic.
As for the one saying to get it fix, thats what i want but i have no gunsmith in town so im looking here first as a first try if i can narrow down to a faulty part and switch it.