Quote:
Originally Posted by venture
Next time you have it apart check the little block cast into the left side of the gearbox. I had this trouble twice now. First time I did like you - had the gb apart 8-10 times, put 3 brand new trigger mechs and 2 brand new steel triggers in. Then I found the problem: Right in front of the cutoff lever and right behind the trigger block is a small square piece in the casting of the gearbox. If this snaps off, then your trigger block slips from the trigger every couple of shots and you cannot get it back right until you take the gb apart again.
I can't find a good picture of it, but look .5 cm directly forward of the hole where the cutoff lever screws on:
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I agree with him, happened on my Systema reinforced gearbox, I drilled a hole where the square block was sitting before snapping off, and I then inserted a nail press fit, cutted to right lenght, shaved on selector plate side so it doesn't scratches, and it works awesome.