Thanks, the silencer resisted even in high power. I used crappy PLA, basically the weakest, but in a thick wall design, a final model can be printed in PETG (same as plastic bottle) that has better resistance and can even be deformed to some degree, or even strong variations of TPU that's like tire rubber but less flexible.
As if it's dangerous... I don't think so if you are on the a 180º area BEHIND the gun, I conduct the test feeling pretty safe with just eye protection in case the silencer decides to go Allahu Akbar.
I found what have gonne wrong conducting more test, looks like if I turn the moderator, the point of impact turn as well, so it's not 100% straight aligned, the fault is on the custom tread design.
Disecting the moderator with a rotary saw I found lead debris and traces of internal impacts on the baffles, and surprisingly, that doesn't break them, just conducts the pellet like a barrel extension, so, with enougth thigth, basic plastic is pretty strong as long as you don't add heat. There is an episode of Demolition Ranch where Matt makes scalextric like tunnels with stupid materials, and surprislingly real bullets follow the way of pretty much anything even on extreme angles.
So... I guess that, cause I made the entry diamether of my baffles a tiny bit larger than the exit one, that have caused to actually redirect the pellet in a curve all along the baffle line without damaging them too much.
If that's the only problem, a corrected model should work just fine, sadly I will have to whait until I can verify that, cause printing it directly on my home is illegal... yeah yeah... who cares... daddy govern cares, gun laws and control are pretty extreme and stupid around here so I will do things 100% legal.