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Flex reg and 22.5ci/370cc/.37L CE Certified CF Tank
Power Flex Combo 22.5ci Carbon Fiber 4500PSI
$425.00 – $435.00Price range: $425.00 through $435.00Select options This product has multiple variants. The options may be chosen on the product pageIntroducing a Hajimoto Productions Exclusive offer!
22.5ci/370cc/.37L CE Certified CF Tank (Available in matte or glossy finish)
Newly redesigned unit
Now has a high pressure and low pressure burst discs!

Installs on the Gauntlet 2 with minor tank shroud modifications, forearm slides right over the carbon fiber cylinder. Installation video at the bottom of the page.



The CF Tank is CE Certified and made to ISO 11119-3 standard. They have seamless aluminum alloy 6061 liner wound with high strength Japan-imported carbon fiber and glass fiber reinforced plastic full composite layers and subjected to an autofrettage pressure. This included a 22.5ci carbon fiber 4500PSI cylinder with externally adjustable Ninja Flex Reg for your custom build including the Umarex Gauntlet 1 or Gauntlet 2! The massive volume of air in these 22.5ci tanks is mind-blowing!
The diameter of the tank is 54-55mm across so a modification to the forearm is required on a Gauntlet 1. I do offer a tank shroud modification service for Gauntlet 1 owners that can be added to a build or provided as a mail-in service.
Please be careful if you have accessories on any of the M-Lok openings as the screws or MLok fasteners may protrude into the tank area and scratch the tank when the shroud is slid forward or back. We recommend that if you have any MLok accessories installed, you remove them when sliding the shroud on or off. We also recommend covering the brass inserts in the tank shroud with cloth tape to protect your carbon fiber finish.
The Gauntlet 2 forearm slides right over without any issue. Only one access hole needs to be drilled so the fill port is accessible at the bottom. See photo below

Consider picking up our extended foster fill adapter to make coupling and filling a breeze.
The Power Flex Combo allows the user to externally adjust the regulator output pressure on the fly with an adjustment range of 800PSI!
When installing the Flex regulator on the Umarex Gauntlet. Tighten the degassed tank and regulator assembly fully to the rifle, then back it off until the fill port is on the bottom and the gauges are left and right. Now fill the bottle with air and all will tighten up solid. Proper alignment will be achieved before the 360° maximum rotation limit is realized.
Comes with a dedicated Spanner Wrench for power adjustment. MADE IN THE USA!
Because of practical limitations, regulator output will be +/- 75PSI to the requested output.
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Hajimoto Gauntlet 2 – Copper Package
$615.00Select options This product has multiple variants. The options may be chosen on the product page** Please note the Copper package does not include barrel work, trigger adjustments, range time, or the rifle-specific detailed power adjustment matrix. **
I supply you with a Umarex Gauntlet 2 that has been thoroughly checked and verified to function as the manufacturer intended. I install a super tune kit, modify the stock and adjust the super tune kit to fly a JSB pellet at the most accurate speed of 860 to 880 feet per second.
For the .22 I will be using JSB 15.89 grain pellets
For the .25 I will be using JSB 25.39 grain pelletsImportant note: If you elect to have our Sidelever cocking system installed, magazine changes require the shooter to hold the Sidelever rearward during magazine changes.
We supply you with an Umarex Gauntlet 2 built to the specifications of this package.
See way down below for a detailed description and breakdown of what is included.Ordering procedures:
You will add any and all items to your cart including this Copper Package Gauntlet 2. Please use the notes section to communicate any special information.
Lastly, if an item you want is out of stock and therefore you are unable to add it to the cart, you can use the notes section to request the item as part of your build and we will settle up before the airgun ships.
When I receive this order, I will build it based on the information provided, and before the airgun ships, any credits or additional charges need to be settled.
Commonly asked questions once the Tuned Gauntlet is received:
Question: How do I change the power?
Answer: Here is a video that demonstrates how the power adjuster works if you should want to increase or decrease the power output for any given ammunition.
HOW TO ADJUST POWER WITH STKQuestion: How do I tune using the STK?
Answer: For written instructions on how to adjust the Super Tune Kit, click the below link.
WRITTEN STK ADJUSTMENT INSTRUCTIONS -
Hajimoto Tune My Gauntlet G1 or G2
$625.00Select options This product has multiple variants. The options may be chosen on the product pageWe completely tune your supplied Gauntlet 1 or 2 Bolt or SL Version, which includes everything listed in the section below.
The service includes a very detailed, time-consuming incoming inspection report with photos and other relevant information detailing the condition of the airgun and all of its parts. This report is provided to you, and it must be reviewed and authorized for the work to continue.
Ordering procedures:
- Add all services and items to your cart.
- Be sure to use the notes section to communicate any known issues or special instructions.
- Check out.
Shortly after the order is received, you will receive an email notification containing shipping information that will include labeling and packaging requirements.
To better understand how the Gauntlet is transformed from a static you get what you get type of airgun into an adjustable-power and tunable PCP, take a look at this video that demonstrates how the power adjuster works if you should want to increase or decrease the power output for any given ammunition to get it to fly at the best rate of travel for that particular ammunition.
HOW TO ADJUST POWER WITH STKWe will build your order based on the information provided from the questionnaire as well as any specific requests, and before the airgun ships, any credits or additional charges will be settled.




