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Not sure some here understand that POLYMERE80 means that the Frame is Plastic.One thing I missed the first time reading through the law is that they refer to two different detection methods for two different criteria.
The 3.7 ounces requirement applies to the whole firearm (not just the frame) and a metal detector. The individual parts have to look like parts of a firearm in an x-ray. This is probably why you can still buy sub-compact pistols with only tiny bits of metal in a polymer frame.
(33)"Undetectable firearm" means any firearm that is not as detectable as 3.7 ounces of 17-4 PH stainless steel by walk-through metal detectors or magnetometers commonly used at airports or any firearm where the barrel, the slide or cylinder, or the frame or receiver of the firearm would not generate an image that accurately depicts the shape of the part when examined by the types of X-ray machines commonly used at airports.
You may IDENTIFY your weapon by engraving a mark on the plate but you cannot Register or Sell it.
So, Plastic Frame and about a half ounce of steel for the trigger assembly.
I have worked with Titanium and Hardcoat Anodized Aluminum slides...
They can be carried through a metal detector. I believe both are mostly invisible to x-ray.
Teflon is a scatterer so no Teflon in the Hardcoat.
Barrel for a G19 is about 1.5 oz Can also be Titanium but not recommended due to expansion.
Plastic Guide Rod
UPK < 1/2 oz
Steel slide you are good for the 3.7 minimum.
Otherwise.....