I have looked for the last year for a few replacement threaded barrels for some of my older guns.
Sig p225
IWI Jericho 941
Ruger 85II
Possibly thinking my Beretta 87T also

I have not found any. So I am looking at Tornado Technologies and Adco Firearms.

Does anyone have any firearms done by either of these two? How was your whole process? Were the ETA's accurate, or were they off? Were there any issues? If so, were the issues dealt with promptly?

Tornado Technologies extended/threaded my CZ 75 Kadet conversion unit. The work is top notch with zero issues. As I recall, turnaround time was in the neighborhood of 3-4 weeks.

Had ADCO thread and extend my Ruger SR1911 9mm barrel. Got it back in a week? They are in the same state as me. No issues at all.

I have L&M do my x5 and the turn around was fast, work was done very nicely, no regrets. You can't even tell it's not just a factory threaded bbl unless you unscrew it.

thanks all. I am thinking of doing tornado tech

Tornado Tech just did the barrel on my P250-22, turn around time was about 5 months. Good work