If 10” or longer barrels are a requirement, that really limits the possible options. You might be stuck with some direct blowback, AR type gun like the Wilson. If a shorter barrel was acceptable, and the other requirements (Glock magazine compatibility and $2k price tag) are still in place, I’d grab a B&T APC9 or SPC9. Vetted, reliable, and really accurate. The APC9 has been awarded a couple of government contracts already. The SPC9 even has an AR style charging handle for people used to the AR manual of arms.