Umarex Max FPS .22 Gauntlet

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Gerry52 said:
Contact Hajimoto for some "power tune" suggestions. Just adjusting hammer probably won't do it. Is the Gauntlet regulated? Where's it set at?

Just found this:
Click to expand...
I reached out to see what the regulator pressure is set at. I've watched his videos. I think i have maxed it out. Would like to see someone, with the Hajimoto STK on the UX Gauntlet 22 Gen 1, post numbers on 21gr pellet.
 
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Snead360 said:
I reached out to see what the regulator pressure is set at. I've watched his videos. I think i have maxed it out. Would like to see someone, with the Hajimoto STK on the UX Gauntlet 22 Gen 1, post numbers on 21gr pellet.
Click to expand...
Hajimoto also used to sell a “shim” kit for the stock regulator.

I bought the shims but never installed any.

My stock .177 regulator is set at 1,100 psi - that’s about 76 bar.

I’d be surprised if your .22 reg is set any higher than 1,300psi (90bar).

It’s a pain to disassemble and shim reg. Not worth it if reg is currently functioning correctly.

Your Haji Supertune Kit included a lighter poppet - making the rifle more efficient with air use - and a lighter hammer spring (designed to be used with lighter poppet) along with hammer spring adjuster (required hole to be drilled in stock to access adjustment).

I’m impressed that you are able to get 840fps with 21g pellets. If I were you, I wouldn’t change anything as I think you are getting max power out of your Gen1 Gauntlet.

If you insist on higher power, you should watch videos on how to shim the regulator - and decide if it’s worth it to you.



-Ed
 
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