I did the MCarbo trigger job on 2 of my Sub2ks as well as one for my friend’s. The older of mine, which I bought over 1 year ago, works perfectly. The newer one was bought at the same time as my friend’s, from the same dealer. I have also installed the heavier weight, “recoil-less” bolt handle on all 3 guns. All internal parts have been polished per MCarbo videos, and the trigger installs were also followed step-by-step.
The issue is that when we fire the 2 newer of the 3 guns, the trigger will intermittently go dead. It pulls smoothly, but it is as if the re-set doesn’t work. I could understand if the trigger didn’t work at all, but this is happening randomly, with no pattern. I have tried different magazines at the range with no change. This morning I took one of them apart again, checked everything, and re-assembled - no joy, everything looks and feels OK, but the issue persists, even when dry firing. Every few racks of the bolt yield a dead trigger - when pressed, the trigger presses all the way back smoothly, as if it is not engaging the sear. When the bolt is racked again, it works fine for a variable number of times, then doesn’t work again, and so on.
Has anyone experienced or heard of this issue, and possible solutions? Thanks!