I tried this when it first dropped, didn't work and I just got around to trying it again as I need to order some things from SCS and I like this design but I can never get the Kabuto TURD to work. I don't know what I'm doing wrong but this is as far back as the BCG will go. I tried pulling it back further and when I did, it locked up and had to push the rear takedown pin out, let a small gap pop up and the BCG flew forward.
I just can't get anywhere with this. I'm going to try the Kev remix as it takes milspec 3 pos but I wanted to see if this worked to begin with, which it didn't.
You may have to file the cam lever where it rides against the bcg, or possibly use the cam over-travel limiter housing. This prevents the lever from going back too far. https://guncadindex.com/detail/Kabuto_Housing_Cam_Limiter:d
this isnt how you time/tune a kabuto.
Timing/tuning should be done on the trigger timing bar (formerly called the "activator"). You remove material from the front leg of the timing bar, until it cycles in SEMI and no longer resets.