Metal, just like the good lord intended! - SIG SAUER P320 AXG Carry Medium Grip Modules

I believe, probably contrary to others, that the good Lord intended cars and guns to be made of metal, not plastic. Admittedly, plastic seats are far more comfortable than metal, but that is the only exception. With that said, this is the way a firearm was intended to be made. Definitely pricey, far more so than plastic or composite, but Optics Planet has the best price that I found. Get it now before Sig discontinues it, which they will, sooner or later.

Pro: aluminum, not plastic or composite
Con: pricey but OP has it at an excellent price