I recently purchased an old Beretta 92FS Centurion with dead factory installed night sights. The front sight is fixed and the rear are standard removable.

I contacted Trijicon because they are the original equipment but they no longer provide replacement service. They referred me to Amerigun USA.

Has anyone has any experience with that company? I would appreciate any information I can get.

If you have some tools its actually not all that hard to do it yourself.  Soak the muzzle end in a jar or acetone or lacquer thinner overnight and you should be able to push the tritium vial out from the front.  You can get replacement vials from mixglo and drop one in with a clear epoxy.  May be worth a shot to try it out before you spend over $100 on new sights.

Might shoot Novak Sights an email & see what they might offer, IMO.

Thank you for the suggestions. Amerigun USA only mills the slide and replaces the sights. Novak does not mill or work on Beretta front sights.

Just saw this.  Try tooltech:

https://tooltechgunsight.com/