Got it . . thanks.
IMO - - -> in stainless,and this small, a do it yourself would take highly specialized equipment.
Back in the old days we used to bend a tube by inserting a perfect sized coil spring inside. This would prevent the tube from collapsing. --- SAWMAN
Just a thought, and not sure of how many coils you're looking for, but maybe buy 2 of the pigtail tubes, cut it, add what extra tubing you need, length or more coils, then braze the pieces together.
If it's on a straight piece, run a copper wire inside the tubing before brazing. Maybe ?
My issue is I'm already working with a "finished" product. Without a high possiblity of damaging the gas tube, I don't think I'd be able to keep fluid in the tube. I also have to keep the gas hole lined up.
Interesting concept. I would not want it myself, but I could see if it lightens the recoil and in the short run is more reliable with some combinations.
For a timing problem or should a say a super fast bolt in an 7.62x39 I put in an H3 buffer and it fixed the problem of two rounds leaving the magazine at the same time. There are bolts that vent gas also.
My concern with the looped gas tube is could it get blocked. I do not have the experience that many of do with the AR, but I did read that the tube is supposed to be self cleaning in that it blows debris of out the tube. I wonder if a loop tube would function the same way.