Notos Internal Porting - Hajimoto Productions LLC (2025)

Notos Barrel Service

This is what we do to our Haji-Notos Custom Builds. but you can have the same service performed on your Notos barrel as well. The Transfer port work increases the port and polishes the opening to allow greater airflow to produce more power more efficiently.

You ship us your Notos Barrel and we execute the following:

• Remove the fixed molded plastic suppressor (the suppressor is destroyed in the process).
• Increase and polish the barrel transfer port.
• Two new barrel o-rings are provided.
• Clean up and polish the barrel crown.
• 1/2 x 20 UNF Threaded Adapter Included.
• Barrel Shroud End Cap and Barrel Guide Included.
• Thoroughly clean and silicone barrel bore.

Notos Barrel Removal

Your Barrel is very easily removed by removing the 2.5mm button head screw on top of the Picatinny rail near the magazine opening. Once the 2.5mm screw is removed, there is a 2mm set screw below it that holds the barrel into the receiver block. Loosen the 2mm screw four revolutions and slide out the barrel.

Shipping

When you place the order for the above-described service, we will send you an order processing notification with a copy of your invoice. Shortly after that, you will receive a detailed notification with the shipping information for you to ship us your barrel for modification.

Genuine Huben Power Dream-Notos TK mounted on a .30L (300cc) 0.36L (360CC) or .50L (500cc)

A complete Haji-Notos Power Plant Combo. It allows for precise power adjustment allowing the Notos to deliver only the power required for the situation. If you want to shoot pest birds in a barn or feed house, you can dial it back to fly pellets as low as 400 ft/s, or if you are hunting grey squirrels and want to deliver a JSB Hades 15.89 gr at over 750 ft/s you can do that too.

FEATURES

• Includes 0.30L, 0.36l or 0.50L 4500psi Carbon Fiber Bottle in Gloss or Matte Black.
• Optional Barrel Band support to provide structural support for the Power Plant.
• Extremely stable externally adjustable regulator Output 500psi~3600psi
• Provides over 130 shots.
• Ultra-stable output pressure
• Power Plenum with rotatable joint for perfect clocking, locked in place with set screws.
• Standard 8mm quick disconnect male foster fitting adapter for filling.
• Built-in Picatinny Rail Section for Bipod or Tripod Shooting.
• Power Increase on the fly but decrease requires degassing the plenum.

See details below

Introducing the Haji-Notos 11 Shot Expanded Magazine!

This is an expanded magazine for the Umarex Notos PCP. The magazine is a brand-new design that loads from the right and employs a removable magnetic lid for easy loading. Allow for a smooth and consistent chambering of rounds without issue.

Please note that our design loads from the right.

Be sure to install and remove the mag at least 10 times before using it so that it breaks into your mag well.

The Haji-Notos magazine works with a red-dot or optic but does not work with Umarex fixed fiber optic sights.

LOADING THE NOTOS MAGAZINE

Installation Video for 1.5″ Picatinny rail on the Umarex Gauntlet forearm.

THIS ITEM IS NOT DESIGNED FOR THE GAUNTLET 30
IT HAS ITS OWN HAMMER PRELOAD ADJUSTER STOCK

The single largest performance increase modification item for the Gauntlet. The Super Tune Kit allows complete power adjustment which opens all the possibilities of lower or higher foot-pounds (FPE) of energy for whatever the user desires. Do you need only 5FPE no problem back off the adjustment using a 5/64″ allen wrench and you are only delivering 5FPE and will realize over 200 shots on a stock bottle fill of 3000PSI!

Want 27-30FPE for dropping that 20lb trash bandit, no problem, crank up the adjuster using a 5/64″ allen wrench and you instantly have the power necessary for either long range or high energy delivery on target. The use of a chronograph is required in order to know what the rate of travel is of the projectile.(Power examples given are the .22 caliber version Gauntlet 1)

For the Gauntlet 1 and Gauntlet 2. Be sure to select the proper generation as there is a difference and improperly selected kits are not returnable.
BE SURE TO SELECT THE CORRECT GENERATION GAUNTLET

CONTENTS:

• Adjuster Plug Assembly.
• Smaller, Lighter Composite Poppet.
• Hajimoto Hammer Spring (Black Long)
• Lighter Trigger Spring (Bright Small).
• 5/64″ Allen Wrench For Adjusting Power.

The single largest performance increase modification item is available for the Gauntlet 1 and Gauntlet 2.
Consider adding the o-ring kit so you have all that you need should one of the factory o-rings get damaged during the kit installation, see option below.

Be sure to follow my written instructions in the document below.
Use the video to install but follow these written instructions to adjust and tune the STK:

Written Detailed Tuning Instructions for the STK

More details below.
Always read the content below because any revised instructions, video, photos, or other links will be there.

Part fits either the original Gauntlet or the Gauntlet 2

THESE BAFFLES CANNOT BE USED INSIDE THE DONNYFL SHORT SHROUD.