Gauntlet question for the big boys…

Forums PCP Airguns Gauntlet question for the big boys…

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    Clarence
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    Member

    I just today received the hammer spring kit (along with the baffle kit) from Hillair. I also received all of the components to check my regulator pressures. My question is, before installing the hammer and spring, I would like to smooth out the chamber (within which the hammer slides). In my mind, I was thinking I would use polishing compound (Cloverleaf to be exact) and a swab, such as a 12 or 20 gauge cleaning tip on the end of a cordless drill. Any thoughts or other methods that you would recommend? I don’t want to remove too much material, I just want to smooth out the bolt and hammer action. I own several small cylinder hones that would work, but I don’t want to mess with clearances. Hajimoto, what did you do to polish the chamber? A piece of 3M Scotch-Brite on an arbor would probably work as well.Thanks to everyone in advance.

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    Alejandroo
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    Hi Clarence
    Maybe, and just an idea, a solder rod 1/8 in one end a lot of cotton raped around with a cloth so it can go in the chamber and you put the polishing compound in there and at the other the drill with a low velocity so I can look inside the chamber from time to time till I get the polish that I want.
    That´s what I would do.

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    Clarence
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    Thanks Alejandro. That’s what I needed to know. The swab for a shotgun goes right on the end of the cleaning rod and will work perfect with polishing compound. I installed the Hillair hammer and spring kit, along with the four baffles. What a difference. Super accurate with many more shots. I don’t know how many yet, I’m waiting for my air compressor to get here. Too much work pumping it up by hand. Gun shoots at 91dB at 760fps with 18.1 grain pellets. I’m gonna shim up the regulator, AFTER the compressor …

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    Alejandroo
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    Great news Clarence, I’ll star the mods at the end of this week, I have to swap the reg to my new 0.38L bottle and then I’ll polish the trigger, chamber and barrel. Let you know the results.

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    Clarence
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     I went a little crazy with the mods without checking the chrono in between upgrades. I installed the Hillair hammer spring kit and baffle kit in my .22 Gauntlet. THEN, I started upping my regulator pressure, starting at 1000psi to 1150psi, to 1250psi, finally to 1350psi. At 1150psi, I was getting 750fps with 18.13 JSB Diablo Exact Heavy. At 1250psi , I dropped to 730fps and about the same at 1350psi. I was disheartened until I realized that at 1350psi, the Hillair hammerspring WITH the extra shim installed, was still not powerful enough to overcome the regulator pressure to open the valve. I added a .010 inch shim (along with the shim supplied with the Hill kit) behind the plunger and now I’m getting 770 to 800fps. I wish I would have done more testing between mods. So, here is what I have done:
    *Set regulator press. To 1350psi.
    *Installed Hill baffle kit
    *Replaced Umarex air stripper (under warranty) because it was cracked.
    *Installed Hill hammer spring with supplied shim, and added my own .010inch shim.
    Db. readings were between 91-96Db. The longest string I have attempted is 50 shots, and the Umarex pressure gauge has not dropped below the 1500psi mark. I will have to do a string on the chrono to see how many shots I get. I seem to be settling in around 770fps. That’s almost 24fpe. I just need to do some more research now. 

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