I just got one of these bad boys in pistol form and am SBR'ing the lower.

https://innovativearms.com/portfolio/iasw-integral/

I brought it to my usual engraver and they told me they cannot engrave M&P15-22 lowers for 2 reasons:

1. Their laser will cut through the polymer.
2. Smith and Wesson use some kind of polymer mix that puts out toxic fumes when they use the laser.

#1 seems plausible enough. #2 is a new one for me.

The gun comes as-is and I cannot use an aluminum receiver, so please no wise-ass remarks. I don't like polymer either and this is my only polymer rifle. I know you guys are relentless with your polymer hate (lol) and it's just a range toy for my kid.

Anyone have experience engraving these? Does anyone know of a competent engraver in South Florida?