According to TFB, it's an aluminum frame: https://www.thefirearmblog.com/blog/...n-soldier-m17/
Old thread but didn’t want to make a new one.
You guys happy with your q5 sf’s? Might get one. I shot like 5 rounds through one at a demo day and seemed good but it was literally 5 rounds.
I’ve put some rounds through other q5s and the only thing that bothered me was the beaver tail area. Kinda square and could irritate the thumb knuckle.