The sanding trick kinda works. What usually causes the problem is a weakened trigger spring. (If it's like the ARES Tavor.) After playing with the gearbox for a bit, the trigger spring can be weakened quite a bit. I find that replacing it with a V2 trigger spring works quite well. I haven't had any semi-auto issues since.
Also, an active braking mosfet is very useful as well.
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Armory
-KWA Tavor TAR21 GBBR
-TM PX4 w/Detonator Aluminum Slide
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