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Illusion is the Hicapa king...but I'll toss in a couple of guesses so long as nobody minds.
1. Sticking nozzle.
- does it always work with TM mags and not WE mags. Take a close look at the rubber seal where the gas would vent up into the nozzle. If it's riding high, it'll push excessively on the loading nozzle and may be causing it to hang up. I've got the reverse problem with a build at the moment where the grip is riding too low.
2. Tight racking.
If the slide (you've got the stock plastic one on now right?) is tight when you're racking it back, then the rails of the blow back unit is rubbing the frame. On the left side, the "leg" of the blow back unit can sometimes catch on the nub that trips and disconnects the valve knocker. I've lightly sanded/polished those two surfaces at times to get a nice smooth operation. Again, most times it's because the blow back unit isn't sitting up high enough in the slide.
3. Not racking back forward.
- are you using the stock TM plastic outer barrel with the stock plastic slide?
- if when it gets stuck, will it go forward if you 1) drop/eject the mag? 2) gently push on the muzzle of the outer barrel?
Best of luck with it,
Tys
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