Proof Research and SI Defense Video

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.

Proof barrels




SI Defense manufactures AR15s and Ambi AR10s as well as a 300WM AR. Check them out at

SI Receiver



Nicholas C

Co-Founder of KRISSTALK forums, an owner’s support group and all things KRISS Vector related. Nick found his passion through competitive shooting while living in NY. He participates in USPSA and 3Gun. He loves all things that shoots and flashlights. Really really bright flashlights.

Any questions please email him at


  • JumpIf NotZero

    Coming soon to real-deal military hardware.