Could the Tulsa shooters claim immunity under Oklahoma's Castle Law?

[DanTex]

76. So one of your sources is a pro-gun blogger with a clear NRA bias, we can toss him out.

The other one, the straight dope, seems to be at least trying to give an honest answer. And the honest answer is... he doesn't know.

...
Are all-plastic weapons feasible? Some think it's only a matter of time. In 1986 Congress's Office of Technology Assessment reported that a 99 percent nonmetallic gun might someday be made using composite plastics, with metal used only for springs. In 1988 a small Florida company called Red Eye Arms claimed it was going to have a prototype plastic grenade launcher ready in 18 to 24 months. Congress got so spooked by the publicity about plastic weapons, even theoretical ones, that it banned their production in the U.S. Whether that scared off Red Eye or they were just hustling the gun industry equivalent of vaporware I don't know, but I can't locate the company now.
...
So who knows? Maybe there really is a nonmetallic gun.

Doesn't really seem to be contradicting anything that Rachel Maddow said. Actually, it seems to support her. There was concern that technology to build a plastic gun existed, and that's what prompted the action by congress.

So once again, you are wrong. Your accusations against Rachel Maddow are empty. When asked for specifics and for evidence backing your claims, you pull the usual pro-gunner moves: hide behind vague generalities, cite a gun blog, and ultimately come up empty.