Sons of Liberty Gun Works?
I dealt with them when they were first getting started a few years back. I ordered a rifle with a 15" KMR, but they had issues getting all their lower receivers and the 15" rail in. This was during the last Ammo/component shortages. Tough time to start a firearms business.
After a long wait, they let me modify the order, and built me a complete lower receiver using a Mega lower. I bought a BCM complete upper with the 15" KMR. I've put around 3K issue-free rounds through that rifle thus far. Not many by some standards, but enough to know it runs well for me.
Bottom line, from my experience, they are very good guys focused on building quality gear. I am planning on taking the 2-day Semper Paratus armorer course when they host another one at some point in the near future.
Take Care,
Buzz