Free: Contests & Raffles.
How about a brass welding rod fairly tight to bore diameter, lots of wd-40 or other spray lube down the barrel on the both ends to help, then tap through with a hammer?Brass being soft shouldn't hurt the bore, just not sure if it would be stiff enough unless you used short sections, each one getting longer so you aren't trying to drive a long, full-length, flexible rod, if that makes sense.
I would think that would be a hard part to source though. im not into airguns, but they might have something designed to pull stuck objects/pellets that's simmiliar?
Weld a screw to a long metal rod and put it in a drill....screw it into the compressed nylon and pull? worth a try, find a screw with very aggressive threads
...Or heat a very small, but stiff welding rod and try pushing it through, causing the center to melt/sofen from the inside out???Or maybe that might backfire and have a Boresnake and a steel rod stuck.......
Terrible ideas, all of them. Get a flute, a bamboo mat, and a bit of 8ncense. Charm that sucker outta there.