Umarex Gauntlet: Regulator Testing and Adjustment Video

Forums PCP Airguns Umarex Gauntlet: Regulator Testing and Adjustment Video

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    Hajimoto
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    Hey Guys & Gals!   Yet another addition to my Umarex Gauntlet series.  In my quest to get the Gauntlet to realize all of its potential, and after I tore the rifle completely apart and smoothed over some bumps in the road, my Gauntlet was still sleeping. I determined that I needed to tear into system #2 out of three and validate if the regulator was, in fact, doing what it was supposed to be doing.

    Concerning the Gauntlet, there is a lot of mixed up information as to what the regulator pressure is supposed to be.  The tank says its 1250PSI printed Umarex press materials say 1150PSI and there was at least one other place that stated it was 1100PSI. I would assume that the regulators for the .177 would be different than the .22 but what I would not expect is the .22 to be lower than the writing on the regulator itself.

    I invite you to join me on this journey as I take a ride through the Gauntlet Regulator maze and come out a winner.

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    BigTinBoat
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    If you want to alleviate blowing the o-rings when you remove the tank, while still pressurized, just unscrew the tank one turn. Next dry fire the gun a couple times and you should hear the shots getting weaker as the air contained in the gun is fired. After 4 or 5 shots the gun should be empty and there should be no resistance when unscrewing. If when dry firing the shots are still loud then unscrew another 1/4 turn and dry fire again until it’s empty. You will then not have any o-ring blow outs.

    Also if you use one of the below on/off valves (just change the gauge out for a 3K one) you do not need a slide check. This also helps you to be able to get your regulator to settle after making adjustments. I fill tank to about 2500 and see what the gauge reads. Then a quick open/close of the valve and look again. You will notice that most times the reg pressure has changed (usually just a bit lower) from the piston seal getting seated. Then I open and close a few more times and note the pressure. Let it sit an hour or so and note the pressure. You are looking to see if the reg is “creeping”. If no creep then open/close a couple more time and see if the reg has “settled” in at the same pressure. If it has and is the pressure you desire, then install. If not repeat the process of adding shims.

    Now if your hammer spring was originally set so that your velocity was a bit on the down side of your velocity curve then raising the reg pressure can actually cause your FPS to decrease instead of increase.

     

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    parallax
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    +1 Great work & thanks for sharing.

    The shim thickness increase modification also works on Air Venturi 2900 psi regulator output tanks.

    Curious as to your shot count reduction at the higher regulator pressure.  Let us know if you get a chance to check.

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    BigTinBoat
    Participant
    Member

    “parallax”+1 Great work & thanks for sharing.
    The shim thickness increase modification also works on Air Venturi 2900 psi regulator output tanks.
    Curious as to your shot count reduction at the higher regulator pressure.  Let us know if you get a chance to check.
     

    
Since he got such a big jump in FPS without changing his hammer spring at all my guess would be that he will not see much, if any, reduction in shot count. Reason being is that the gun is running much more efficient then it was. I would bet that the gun is even quieter now too. If I had a gauntlet I would be figuring out how to add a hammer spring adjuster to that the gun can now be fine “tuned” to the pressure.

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    Buckeye
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    Haji,
    Thank you so much for your effort on putting this together.

    I also have an underperforming Gauntlet, highest fps for 14.3 is 808. This seems like a very simple process to get this gun up to it’s true potential.

    Thanks
    Scott

     

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    Springrrrr
    Participant
    Member

    “BigTinBoat”

    “parallax”+1 Great work & thanks for sharing.
    The shim thickness increase modification also works on Air Venturi 2900 psi regulator output tanks.
    Curious as to your shot count reduction at the higher regulator pressure.  Let us know if you get a chance to check.

     

    
Since he got such a big jump in FPS without changing his hammer spring at all my guess would be that he will not see much, if any, reduction in shot count. Reason being is that the gun is running much more efficient then it was. I would bet that the gun is even quieter now too. If I had a gauntlet I would be figuring out how to add a hammer spring adjuster to that the gun can now be fine “tuned” to the pressure.

    
Try this link out.

    https://www.gatewaytoairguns.org/GTA/index.php?topic=102095.0

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    BigTinBoat
    Participant
    Member

    “Springrrrr”

    “BigTinBoat”

    “parallax”+1 Great work & thanks for sharing.
    The shim thickness increase modification also works on Air Venturi 2900 psi regulator output tanks.
    Curious as to your shot count reduction at the higher regulator pressure.  Let us know if you get a chance to check.
     

    
Since he got such a big jump in FPS without changing his hammer spring at all my guess would be that he will not see much, if any, reduction in shot count. Reason being is that the gun is running much more efficient then it was. I would bet that the gun is even quieter now too. If I had a gauntlet I would be figuring out how to add a hammer spring adjuster to that the gun can now be fine “tuned” to the pressure.

    
Try this link out.
    https://www.gatewaytoairguns.org/GTA/index.php?topic=102095.0

    Thanks for the info, but I use a much easier method to adjust the efficiency. What I was meaning is that I have never been inside a gauntlet so I do not know what might be in the way of making an adjuster. I’ve made plenty for other guns. Kinda like a QB (which I would think the gauntlet would be similar) the bolt that hold the end cap on extends thru the cap so you need to drill your adjuster “off center” as well as convert to “cock on open”.

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    spysir
    Participant
    Member

    Nice video and good user tips.
    I tend to worry about newbie folks seeing something on the Internet , thinking ( ? ) they know everything they need to know and charging ahead.

    Safety first everyone! Incorrectly adjusting your reg could cause severe injury or worse and naturally your warranty will be gone.

    My .177 came at approx. 1,100psi.

    Interesting to see they used the 850psi model piston instead of the pro or srt -whatever it is-  which has the Brass piston and other slight differences, like the single spring instead of the spring washer stack.

    If adjusting DO pop that reg as BTB suggested, also DO the leak test, it will save you time.

    Parallax, same ninja manufacture, different bonnet & piston but that doesnt matter.

    The Gauntlet certainly IS over sprung in stock form. Cutting 2  coils off retains the same fps. Seems to be the same as a QB spring which will handle 1,400psi so it is vastly oversprung running stock psi, and wasting air, right?

    A velocity adjuster is very very easy on these as they do ” cock on open” unlike a QB.
    Simply drill ( soft metal too ) an offset hole in the end cap avoiding the rear trigger screw, tap and install a bolt or hex head -with vibra-tite  perhaps- instant adjuster.

    No idea on Umarex or others psi claims regarding either the bottle/regulator stamping or manual or advertising. But if I were just going to type on as if I knew anything ( I do not )
    I might think Ninja makes these, and ,  stamps 1250 on them as a legal disclaimer  that the MAX intended psi is 1,250 ATTORNEY ordered? This does appear to be the 850psi reg re-worked. On their higher psi tanks the “pro” or other bonnet and a different piston are used , think the 4,500psi buddy tanks.
    Now the technology on the pro and super high output are better as far as recharge rate, leak down-creep- and they use different tops ( fill units) and they are NOT aluminum as the 850psi/Gauntlet is.

    Mr. H,
    Did yours have the forward trigger screw slightly protruding into the tube?

    Thanks,

    John

     

     

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    Hammer
    Participant
    Member

    Wow, excellent work Hajimoto! Very thorough and easy to follow. 

     

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    2D1C
    Participant
    Member

    Excellent video again. Thank you for the time and thoroughness. I don’t own one?  But  need to learn these things if I migrate to a regged gun.

     

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    Neo513
    Participant
    Member

    Great vid..my gauntlet had one shim ..fps low 700s..put in 2 more .002 shims to bring to total .005..1,500 psi on regulator now.. Fps 970+ with 14.3 crossmans, if I use alloy pellets fps would be 1,000+…Now it's a real Gauntlet …Beast mode..Hajimoto u r the man…

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    Hajimoto
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    Neo513

    Great vid..my gauntlet had one shim ..fps low 700s..put in 2 more .002 shims to bring to total .005..1,500 psi on regulator now.. Fps 970+ with 14.3 crossmans, if I use alloy pellets fps would be 1,000+…Now it's a real Gauntlet …Beast mode..Hajimoto u r the man…

    You are very welcome, remember that these paintball regulators will settle in over time so be sure to double check the output after 300 shots or so you may find it is 1550 as things settle in.

    Be safe!

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    Neo513
    Participant
    Member

    Will do thanks..only 33 shots so far has problem with mag…but I'm pretty mechanically inclined and I have fixed the problem oops, lol way after I complained to umarex and i asked for another magazine..let's see what the reply is.

    to Springrr the sound of the pellet hitting is all I hear.very quiet and at over 950 fps dangerous… 

    Haj I will check regulator pressure after 300 rounds…I just sold a gam o urban online because the highest fps I could wrangle from it was 910 n then would drop off from there to 880 for about 20 shots and thats it…..much happier with Gauntlet.. Guys this mod is very simple if you can use an Allen wrench and an adjustable wrench you are good…Thanks Again Hajimoto👑

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    Neo513
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    Pressure check valve i built

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    liveasyouwill
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    Member

    Hey All!

    I realize this is an old thread and applies to the .177/.22 cl Gauntlet, but I have a Gauntlet .25cal which is new as of Aug 2019. Being only about 1500 shots fired through my newest habit, PCP rifles, I must say i am bioth impressed and unimpressed at the same time with the velocities I am getting out of the Gauntlet .25. I don't have a chronograph, but i also know i should not be seeing a 19.91 grain H&N through my 12x Nikon scope flying through the air most shots. At the point of wanting much more out of this 25cal Gauntlet rifle, watching this video and hearing about shims to place into Ninja regulator which is stock on this, i am wondering if shims are same size as the 177 and .22cal and also WHAT IS MAX/BEST PSI to shim .25cal Gauntlet to/at?

    soooo…..

    Does anyone know what the max PSI/shims can be added on the  Gauntlet.25cal to hopefully speed up velocities/improve range/ and maybe and quiet down. i already tried drilling out one hole per another one of the videos he produced. its 2" out from barrel mount…..

     

    i sure am already impressed with accuracy at up to 65yard and how effective it is on pest control within 30-45 yard even though i can literally see the various grain 25 cal rounds i fire even at max 3000psi charge.

    also, what is fastest i can run a $350.00 Chinese high pressure 4500psi compressor to fill my Gauntlet, Bulldog, etc?? i have a bucket for distilled mineral-free water and external pumping to keep temperature between 19celsius – 33 Celsius MAX on pump temp gauge. I usually just top off and only fire two 8-shot .25cal magazines and top off(with Bulldog, I only run about 5 shots/refill. tank doesn't get warm to touch on either rifle tank.

     

    thanks again, All, for all the random information and input about how to max out this base rifle .25 Gauntlet

     

    thanks for any advice. i am impressed with this 25 Gauntlet, in a similar fashion as I have been with Bulldog/Bullppup types too.

     

     

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    NickNorthGA
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    Liveasyouwill you could always just go on amazon and get a $10 2000/2100/2200 regulator an throw it on if you don't want to mess with shimming and testing. I put a 2200 on mine and im getting around 60fpe depending on pellet. jsb 25gr hitting right over 1000fps.

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    Hajimoto
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    Member

    @liveasyouwill – The .25 Gauntletcomes stock with 1900PSI output on the regulator and the shims that are used on the .177/.22 are exactly the same for the .25. I have taken the .25 Gauntlet as high at 2500 PSI on a few Slug builds that I have tuned and it performs well. I would recommend that you build yourself a simple Regulator tester so you are not guessing as you cannot calculate gains if you do not measure all the variables.

    Please keep in mind that if you want more power and you want to make the rifle quieter, I would recommend that you go with a DonnyFL Short Shroud and Sumo for .30 Cal. The total volume of the stock shroud is just not capable of handling the amount of air that 2000PSI+ delivers out the muzzle. I have successfully tuned over 100 .25 Caliber Gauntlets in this way and they perform respectfully.

    Let me know if you have any other specific questions and I will assist in any way I can.

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    liveasyouwill
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    Member

    Frstly, THANKS for taking time to respond!, MrHajimoto and Ni I just noticed….

     

    Hajimoto: '…I have taken the .25 Gauntlet as high at 2500 PSI on a few Slug builds that I have tuned and it performs well…'

    With that piece, Hajimoto, why did you select 2,500psi and did you do much longterm/high shot counts on rifle to see if it damages internals? i'm a quick learn, and i surely appreciate folks such as yourself taking such indepth time to provide the rest of us HARD TO FIND….HELP…on this amazing PCP world. Does 2,500 reg drastically drop your shot count? also, i see you sell a 22CI tank for $139 on your website, which only allows for a max tuning of 2,300psi rather than the 2,500 you mentioned. is this due to possibly damaging rifle that you do not have SuperTuning to 2,500 on your Ninja tanks you sell? also, can i fill my stock ninja tank using 4,500 China compressor H2O cooled and fill from 1K to 3K without stopping or must i take a break when temp hits 35Celsius?

     

    -NickNorthGA- 'Liveasyouwill you could always just go on amazon and get a $10 2000/2100/2200 regulator an throw it on if you don't want to mess with shimming and testing. I put a 2200 on mine and im getting around 60fpe depending on pellet. jsb 25gr hitting right over 1000fps.'

    IMPRESSIVE stats with regulator swap! How long have you been running the 2200 regulator and do you fire a lot? ie in last week, ive gone through 1,200 rounds between .25 and 357 in backyard range…meaning I fire daily, minimum 100 -200 rounds,daily, to stay tuned. with that, do you put a lot rounds through with the 2,200 regulator or have you only fired a few hundred rounds? I read about people destroying the internals of the PCP rifles trying to 'tune'. I tried to find regulator like you suggested on amazon and i come up with only similar…

    https://www.amazon.com/GFSP-Paintball-4500psi-Regulator-Pressure/dp/B07H8TQF44/ref=sr_1_12?keywords=regulator+2200+psi&qid=1567884683&s=gateway&sr=8-12

     

    thanks so much for the HELP! I cannot believe how difficult it is to find ANY human at any store in Western WA who know anything about these types of NonGunpowder lead-throwers

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    Hajimoto
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    liveasyouwill

    Frstly, THANKS for taking time to respond!, MrHajimoto and Ni I just noticed….

     

    Hajimoto: '…I have taken the .25 Gauntlet as high at 2500 PSI on a few Slug builds that I have tuned and it performs well…'

    With that piece, Hajimoto, why did you select 2,500psi and did you do much longterm/high shot counts on rifle to see if it damages internals? i'm a quick learn, and i surely appreciate folks such as yourself taking such indepth time to provide the rest of us HARD TO FIND….HELP…on this amazing PCP world. Does 2,500 reg drastically drop your shot count? also, i see you sell a 22CI tank for $139 on your website, which only allows for a max tuning of 2,300psi rather than the 2,500 you mentioned. is this due to possibly damaging rifle that you do not have SuperTuning to 2,500 on your Ninja tanks you sell? also, can i fill my stock ninja tank using 4,500 China compressor H2O cooled and fill from 1K to 3K without stopping or must i take a break when temp hits 35Celsius?

     

     

    I do not recommend that the average user up the reg to 2,500 PSI only because there are other things that need to be done to the PCP at those pressures. I offer a Slug build where I will take a Gauntlet to 2,500 if necessary to achieve the FPE desired. I only recommend going higher than 2300 in a slug build.
    I would not recommend increasing the regulator pressure at all unless the poppet is changed. The stock poppet has too much surface area and will require incredible hammer energy to open. As for damaging the PCP, I only recommend pressures above 1300 PSI in the .25 caliber. The valve body is stainless steel and there are 3 dedicated fasteners holding the valve rather than the one dedicated fastener for .177 and .22.

    I have a .25 that I have operated at 2,300PSI since the day it was released and the only damage realized was to the targets hit by the PCP. Keep in mind the Umarex Gauntlet has a relatively small plenum on 21 or 22cc's so the only way you can make more power is with higher pressures but because a stock Gauntlet has no way to increase hammer energy you will quickly hit the performance wall.

    As for shot count, as I said previously, we only have 21cc's to work with so higher volume per shot by way of elevated pressure equals lower shot count.
    The relative small tank on a Gauntlet can be filled in one session but I would recommend that you fill a caron fiber tank and fill your gun from that. A reciprocating compressors output is in pulses, these pulses will shorten the life span of your burst discs on the Gauntlets tank. I run my Yong Heng to 58°C as a maximum temperature so 35 is a long way off ;)

    Again, NEVER screw a tank and regulator with an output greater than 1300 to a .177 or .22, they are just not made to handle those pressures. Again, never expose a stock valve poppet to pressures greater than stock as you will induce valve lock due to not having enough hammer energy to fire the rifle.

    I hope this answers your questions.

     

    • This reply was modified 8 months ago by Hajimoto.
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    NickNorthGA
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    Member

    I have over 1000 shots on it with the new reg no problems so far. I still need to get a new poppet and maybe valve retainer. I've had it to 2300 shooting 49gr slugs and it grouped better than i thought it would. With my particular gun i now have it at 2100 to shoot jsb 33gr very well and accurate. I really wont shoot anything lighter so Im always at 2100 or 2300 if im going hunting. I only get about 20 good shots though at 2300 even with the bigger tank.

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