Hi. I've installed the Hephaestus set also. Everything fit perfectly for me. I do however have the issue the gun firing in full auto in semi mode. This happens only when i pull the trigger slowly. Everything looks ok with the trigger set, except as with you part 87. This doesn't spring back , I might swap it out for the original.
I also have installed the RA-Tech recoil buffer kit and also the FG Airsoft High Speed buffer. Ive noticed the usual crack in the trigger bix which may also be compounding the problem.
Cheers, P.
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