They werq no better than an FX reg which is much easier to adjust due to the hex screw in it.
The Huma regs have the straight flat blade screwdriver adjustment which is a bit more difficult to adjust.
The Huma regs do have a brass regulator rod while FX has plastic one. It should last longer.
The FX has a brass regulator body while Huma has an aluminum one. It should last longer.
One better than the other? Probly NOT they seem mostly the same to me.
I went with a Huma only because FX was having a moment in their communications with me and it was faster to get the Huma than to get parts for my FX at that moment in time. I had the Huma in my hands and installed six weeks before FX straightened up and sent me a decent part.
Still the Huma regs lack nothing and werq fine as do many others.
The instructions on the Huma site should show you where they go. We still don’t know what gun you are even talking about. But they go on the reg piston and if it’s an AMP reg replacement, you do get an extra disc.