While Geissele hasn’t been in the complete rifle game for very long, their accessories (triggers, rails, charging handles, scope mounts, lower receiver parts, etc) are rock solid, known quantities that have been proven in LE and military testing and field use. Nothing in life is guaranteed, but it’s quite likely that Geissele put the same level of thought, testing, and quality control into their complete rifles as they did their accessories. There is a reason that Geissele products are so well regarded in the industry. If I was in the market for my first and only AR15 and had your budget, I’d also grab the Geissele Super Duty rifle mentioned earlier.
If you would prefer Sons of Liberty Gun Works, they’re offering two rifles during their Black Friday sales week for $800 and $900 but they don’t have all the luxuries of the Geissele: https://sonsoflibertygw.com/sale-items/