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I did do those upgrades (a while ago...Dec or Jan I think) and test fired it before shipping it out. Obviously it's hard to vouch for what's done to it and how it's used after it leaves...but my read of Turnbull was that he was a solid guy to deal with.
Semi and Full Auto were working fine when it left the shop. I ran 200-300 rounds through it in testing, switching between semi and full throughout.
I received the rifle pretty much fully disassembled and reassembled it and shipped it out intact. The only part that was not included for me to assemble was the rear stock and the wiring extension that would extend out from the mechbox and through the stock to the battery. Otherwise I shipped it out fully assembled. I did attach at least two different pigtails to the mechbox connector and did attach/reattach connectors to it several time throughout the upgrade, reassembly and testing. I cannot vouch for the extension wire. If the small connector that bridges the wiring between the mechbox and extension is in question...consider simply soldering and shrink-wrapping the wires to remove a point of low throughput in the wiring.
The v3 lockup that you're experiencing is somewhat common when the selector get's "halfway inbetween" settings.
I cannot remember if there was the plastic cap over the screw of the selector arm on that rifle...but regardless continue with:
- on the pivot point of the selector arm, there may be plastic cap hiding the screw. Use a fine flat screwdriver or knife edge to get under it and pop it straight off. Don't tip one side off...it may break/deform the tab on the other side of it. Just straight up and then to put it back, press it straight down.
- under that cap, if there was one, there should be a philips screw. That screw attaches and holds the selector arm onto the selector arm/cam of the mechbox. Tighten that screw and it will press the selector arm tighter against the AK body. The nub on the underside of the selector arm will engage the indents of the body more positively and stay in position. Tighten too tight and it becomes very stiff to move the selector...too loose and you've seen how the selector will drop out of position as the AEG vibrates as it's shot and from shaking and running around with it. Personally, I do not put loctite on that screw...it's engaging into the mechbox shell and I wouldn't risk stripping that out...but temporary (blue) loctite is an option. Myself, I just tighten it every now and then as needed.
I hope that helps. Again, while I cannot "warranty" anything once it leaves my workbench, I'm obviously interested to see that anything I work on performs up to scratch.
PM me if needed.
Tys
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