Just readjusted my PTW RIS and outer barrel, I was running around my house swinging it like a base ball bat by the end of the barrel. I'd like to see someone do that with a plastic bodied M4A1. I can drop my gun, run into trees (still have a scar on my arm from doing that at the LZ...), get bodychecked (has happened at the mill), swing it on the sling to get it out of my way to draw my GBB and have it smash into a steel pole. Of course all this is possible with most other guns with plastic bodies, its really just armalites that suffer horribly from it.
As for the fiber glass, yes CA uses fiberglass in a lot of their non-metal guns. Fiberglass is just the glass filaments which still need to be in some sort of resin. As far as I know its just fiberglass injected into ABS plastic. Even look at Pelican cases, they are all fiberglass reinforced but I'm not sure what the plastic binder is.
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