I concur. A buddy is running an all aluminum can on his .223. he only shoots at coyotes so not a lot. I would of not went with it but it was cheap years ago.While it's 30 cal rated, I'd still be spooked of the aluminum aspect.
For a little money, I'd look at a Dilligent Defense Enticer S, fully hardened S/S & weighs less.
Diligent Defense Enticer S Suppressor - Diligent Defense Co
The Diligent Defense Enticer S is 100% CNC machined 17-4 stainless laser welded & heat treated. Rated for 7.62, 300BO, 300WM or smaller caliber.diligentdefense.com