Author Topic: Gauntlet accuracy issue  (Read 582 times)

d_boom

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Gauntlet accuracy issue
« on: September 20, 2018, 06:10:32 PM »
HELP, Over time the accuracy of my .22 cal. Gauntlet has deteriorated.  I have cleaned the barrel on several occasions.

When the Gauntlet was new, April 2018, the velocity was checked by chronograph and data recorded.  In April the
Gauntlet .22 average of 790 ft/sec. velocity spread was 7 ft/sec. with a std. dev. of 2 using  JSB 18.13 pellets, other
pellets were also tested with similar results (JSB 15.89 gr. 827 ft/sec. and velocity spread of 9 ft/sec. and  H&N. 
Barracuda Match 21.4 gr.  736 ft/sec. with velocity spread of 6 ft/sec.).   I was happy with these results.  Since the
Gauntlet is not provided with a hammer spring adjustment nothing has been adjusted or taken apart other than a trigger adjustment requiring removal of the air-tank and stock.  The Gauntlet has been mostly shot indoors and has not been subjected to dirty conditions.  With the accuracy results shot in the beginning I don't believe burrs are an issue.   After shooting over 3,000+ pellets over the last 5 months, I again checked velocity with a Chronograph at an average of 828
ft/sec. with a velocity spread over 70 ft./sec. still shooting JSB 18.13 pellets because accuracy deteriorated, WHY?   


  • Wichita, Kansas

caniborrowsomeammo

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Re: Gauntlet accuracy issue
« Reply #1 on: September 20, 2018, 09:17:06 PM »
Just throwing a few things out there, and I don't know the workings of your gun.
  Perhaps the reg? Not knowing how dry your air is it could have built up some corrosion.
 Try another tin of pellets over the chrony, bad batches have occurred in the past.
  Now that I think about it I would first check the hammer for dirt or galling. That would cause erratic velocities.
Buncha BB guns that I don't get to shoot as much as I like. Building duck boats now that I'm "retired".

Alan

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Re: Gauntlet accuracy issue
« Reply #2 on: September 21, 2018, 04:58:20 AM »
I agree with the hammer issue. It is very important to keep the hammer and its raceway clean. Just the tiniest amount of wobble is all it takes to effect the spread. Once you clean the hammer and its raceway, lube it with graphite or Danzac (tungsten disulphide). Don't use grease or oil.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

d_boom

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Re: Gauntlet accuracy issue
« Reply #3 on: September 21, 2018, 05:01:19 AM »
I do not use a hand pump, not dry air.  Air comes from a tank filled from a pump fitted with two dryers on the output pressure  side.  I have disassembled the Gauntlet, no dirt, galling, or corrosion.  Internal sliding parts are well lubed.  I suspect the the regulator is not working.  Dissembled the regulator - internals were dirty, the piston has been rubbing inside it's cavity, as shown by scratches on the aluminum piston.  I think the dirty regulator with a scratched piston is at fault.   Looking over the Gauntlet schematic, there are no part numbers for the regulator or tank. 

Contacting Umarex about lack of part numbers on the Gauntlet drawing for the tank and regulator, they replied they do not supply these parts for the Gauntlet!!!

Ninja manufactures Gauntlets' regulator and tank assembly.  I contacted Ninja and was advised to order a rebuild kit from one of their distributors.  A rebuild kit includes, among other parts, a replacement piston with "O" rings. - thanks for your input - Danny
  • Wichita, Kansas

Alan

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Re: Gauntlet accuracy issue
« Reply #4 on: September 21, 2018, 05:29:38 AM »
Well, you live and learn. I mentioned the hammer, because I've had thad issue several times.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

d_boom

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Re: Gauntlet accuracy issue
« Reply #5 on: September 21, 2018, 01:38:34 PM »
I need to look at all possibilities, several are telling me about hammer issues.   I took my the gauntlet apart and lube
the hammer with moly paste from Air Venturi, if this is a mistake I will clean it out and use graphite or Danzac (tungsten disulphide).  When looking for Danzac on the internet a got messages it has been discontinued, is there another product
to use?  Any special instruction on application? thanks for the help - d_boom
  • Wichita, Kansas

Alan

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Re: Gauntlet accuracy issue
« Reply #6 on: September 21, 2018, 02:47:23 PM »
It is!

What happen is, the grease, oil, sticky stuff, whatever, collects dust and grime, and gets gooey. Most knowledgeable guys say to use graphite, and it works very well. Danzac is slicker than graphite, but costs about 10 times as much. But so little is needed, that the cost isn't an issue. here is a guy on eBay sleeping Danzac as Derby (wood) Car Wheel Lubricant for $10. There is enough to lube several dozen airguns.
  • Roswell, New Mexico
Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

d_boom

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Re: Gauntlet accuracy issue
« Reply #7 on: September 24, 2018, 02:01:29 PM »
Found Danzac listed under WS2 (Tungsten Disulfide) and ordered.  Inspecting the bolt's pellet probe using
a tissue showed an air leak when shot, replacement seals are on order also.  I will install a Jefferson State
Air Rifles Tune Kit so the hammer force can be adjusted, and have better air flow around the poppet valve.
While waiting for parts I used JB bore cleaning compound for a clean and lead free bore, bore appears to
be smooth.  Thanks all for the suggestions I will report back my success fixing my Gauntlet back to its
former accuracy.
  • Wichita, Kansas