Another thing, typical nylons will be flexible and impact resistant when saturated with water (1-2%) but brittle when dry, which is how they get when near a heat source like an engine. The best example is it is like spaghetti, dry vs. cooked. Modifiers can maintain the flexibility and impact resistance, as well as stabilize the polymer for heat, UV and other enviros. Pretty much all the plastic guns these days are modern generations of nylon, and they do pretty well.
Back in the day when I worked for a gun co., we had an internal joke:
After the nuke war, all that will be left on the battlefield will be pistol grips, handguards and stocks!


