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[Erose999]

54. Bakelite has been around since the 1930's. If a bakelite barrel would have worked it'd have been

done already, especially during the WW2 when we needed more guns than we had steel available to produce. Also, as I understand it Bakelite is not well suited to 3d printing.

The friction of the projectile against the barrel is only 2-3% of the heat, but those figures are for a lead or copper jacketed bullet on a steel barrel. Friction figures for plastic/plastic could be much higher. Theres also the fact that plastics will not stand up to repeated use as well as metals. Once they're hot, they can't be cooled effectively. We've yet to see widespread use of plastic engine blocks, for that reason.

And the system you are describing is basically a souped up paintball gun or T-shirt cannon, albeit with a more lethal payload. I just don't see it becoming a problem.