Four Guys Guns posted this video on their website. I can’t embed the video so here is the link.
It is a short video showing the manufacturing of Proof Research Barrels and SI Defense receivers.
Proof Research makes carbon fiber wrapped barrels. Here is a video we posted last year.
SI Defense manufactures AR15s and Ambi AR10s as well as a 300WM AR. Check them out at Si-Defense.com