[ORGA] M5 Muzzle Velocity Adjustment Nozzle Screw for GHK Gas Rifles

Set of 7 for adjusting muzzle velocity of GHK gas rifles

Many GHK gas rifles (M4, Steyr, AK, etc.) have muzzle velocities that are too high when using domestic Freon 134 compatible magazines or CO2 magazines. Unlike electric guns, cutting the inner barrel does not significantly reduce muzzle velocity, especially when using CO2 magazines. Until now, ORGA has shipped GHK gas blowback rifles with M5 threads on the tip of the loading nozzle and a special ORGA-manufactured "M5 throttle screw" to reduce muzzle velocity to the appropriate level.

This M5 initial velocity adjustment nozzle screw is an assembly of the throttle screw, which is made up of screws with different inner diameters.
Many GHK gas rifle users make their own modifications such as HOP tuning (replacing the inner barrel) or bolt replacement (changing the weight), so we have packaged screws with different inner diameters to accommodate a variety of settings.

This product is designed for GHK, but it can be used with any rifle (including bolt-action rifles) as long as the nozzle can cut M5 threads, so it is convenient to have a set.

■Why do we only sell screws?
Unlike WETECH, VFC, Western Arms, etc., most of the loading nozzles that come with GHK products when they leave the GHK factory are glued in such a way that they cannot be disassembled. If they could be disassembled, you could adjust the internal valve spring tension or change the valve itself, but due to the above issue, you need to adjust the muzzle velocity without disassembling the nozzle, so you need to cut the screw directly from the tip of the nozzle.
When cutting the screw, chips will get into the loading nozzle, so blow them away with an air duster or similar.

Below is the product assembled to the loading nozzle.

■ What is M5 thread cutting?
Many people may not understand what thread cutting is. Thread cutting refers to creating a "thread" where there is no thread (female), and a tool called a tap is used to create the screw.

To cut an M5 screw, first drill a pilot hole (Φ4.2), then turn the tap, screw it in twice, then return it to its original position (to remove any chips).
It may seem difficult, but it's actually quite easy, so give it a try.

The taps are the following products, and basically any of them will be fine.
Go to MonotaRO page

You can see how to turn off the tap in the video below.
MonotaRO How to cut a tap

■Precautions for this product <br>As mentioned above, assembly is very easy, but since this product is designed to "reduce the initial velocity," be sure to apply a "lock" when installing and once the setting is determined.
If the screws are completely glued, they may not come off when you change the settings, so we recommend applying a small amount of red thread lock and using the screws in an environment where they will not loosen due to the vibrations of shooting.

■ Product specifications <br>The following data is a reference value measured using the GHK MK18Mod1 (10.5 inches).
The .134 magazine was measured by warming the magazine to about 25 degrees, and the CO2 magazine was measured using a new CO2 tank (Marushin). BB bullets used were G&G 0.25g.
Depending on the type of rifle, the length may be longer or shorter, so please adjust your own rifle based on the reference values ​​below.
For CO2 rifles, Φ1.5 and Φ1.8 are ideal.
Please consider the length of the inner barrel when determining your own settings.

Inner diameter Φ1.5 Red
When using 134: 43.46m/s
When using CO2: 74.08m/s

Inner diameter Φ1.8 Silver
When using 134: 57.86m/s
When using CO2: 84.39m/s

Inner diameter Φ2.0 Gold
When using 134: 67.24m/s
When using CO2: 88.56m/s

Inner diameter Φ2.3 Green
When using 134: 78.55m/s
When using CO2:-

Inner diameter Φ2.5 Silver
When using 134: 84.26m/s
When using CO2:-

Inner diameter Φ2.8 Blue
When using 134: 89.36m/s
When using CO2:-

Inner diameter Φ3.0 Black
When using 134:-
When using CO2:-