Some pro-gun organizations were supportive of the bill, including the NSSF (a lobby group of gun retailers and gun manufacturers ... not hard to see why they were pro the bill).<p>Ultimately, the bill would have significantly increased manufacturing costs, banned many existing products and have done absolutely nothing for national security.<p>Guns require metal parts. A gun with a polymer barrel is at worst a very inaccurate single shot device, more likely it is a hand grenade.<p>Currently manufacturers of polymer framed guns dope the polymer with a substance (I forget what it is) that makes them visible in xray scanners.