VFC/ASG – M40A3 Tuning Kit


This Tuningkit for the VFC M40A3 (licensed by ASG) is manufactured by the same tech-team who also makes the Tuningkit for my VSR-10 sniper rifle.

I installed the VSR-10 Tuningkit into my VSR-10(gun I used before the SSG24) 8 years ago and it shot about 60.000 BBs through the barrel. It has never failed or disappointed me so far. All Tuningkits are made to the same technical requirements, so they all provide the same power and accuracy.

The parts are handcrafted, tested and shipped from South East Asia to every country around the world in 2 weeks. The tech team knows what they are doing, putting in a lot of research and effort into the Novritsch Tuningkits to provide the best quality spring sniper upgrade kits available on the airsoft market.

The Tuningkit includes everything required to achieve the same power and accuracy you see from my videos.

6.01 Precision Barrel, 7mm Spring Guide, High Pressure Piston, Cylinder, Cylinder Head,Trigger Sear, Piston Sear, Spring Guide Stopper.

Gun is not included in the Tuningkit!

If you want a gun that shoots as powerful and accurate as mine, just get an VFC M40A3 (licensed by ASG) and install this Kit into your rifle.

If you are not experienced with working on airsoft sniper rifles this product is not for you.

Upgrading an airsoft sniper rifle can be difficult. If you have never done it before, I recommend getting a Novritsch SSG24 instead since it’s a out of the box solution which shoots as good as a gun upgraded with a Tuningkit – no modificatons needed.

By purchasing one of these Tuning Kits you are not just upgrading your gun to the highest possible performance level in airsoft. You are also supporting me, so I can continue to create videos on my youtube channel.

Base price  420 $
Shipping price internationally  55 $
Shipping Time  2 weeks

Spring selection

The only thing you have to select is the spring power. Everything else is already included in the kit.



High Pressure Piston

The polyurethane seal cap is an industrial standard for high pressure systems. It provides better seal than standard O-rings and is oil and acid resistant. The Piston also comes with a teflon glide ring for extra smooth piston travel.

To keep the Piston leightweight the shaft is made from anodized alloy. The base, where all the force of the sears is applied, is out of stainless steel. This material combination makes the piston durable but still lightweight.


The springs are made from Silicon Chrome Steel. This material allows light compression but fast return.
The springs also get compressed for a week before they get shipped, to provide the best fps consistency possible.
I prefer the Strong Spring (550 fps 0,2g BBs) but you can choose your desired fps in the spring selection.


The Springguide is highly polished to reduce the friction between the Springguide and the spring. It has an extended length for maximum guide. The base perfectly fits into the High Pressure Piston, this prevents the system from slamfiring.
Unlike other brands springguides this one is made from one solid piece of stainless steel.


The Cylinder’s outer surface is highly polished to reduce friction while compressing the spring. The inner surface is polished to a mirror finish which supports the seal of the High Pressure Piston. It also reduces the friction of the Piston travel.

The back of the Cylinder is threaded into the stainless steel shaft and secured with 3 pins. This makes the Cylinder extremely durable.

Cylinder head

The double O-rings provide a perfect seal, even at the high air pressure produced by the 650 fps spring.
The lengh of the polished stainless steel nozzle is optimized for constant BB backspin.

6.01 Precision Barrel

This barrel is the most unique part of the Tuningkit. It gets polished by hand for several hours to achieve this kind of perfection. A real mirror finish reduces the friction between BB and barrel to a level that the velocity of the airsoft BB gets boosted up to 20 fps. (The gained fps are already included in the spring selection)
Unlike any other precision barrel on the Airsoft market, it gets straightened in a complex process and checked with a sensitive measurement device to ensure that the barrel is perfectly straight.The material used is a durable and oxidation resistant High Speed Brass.
The outer diameter is extended to 9,6mm to reduce the vibrations created by the release of the Piston.
The barrel has an excact inner diameter of 6.01 mm and at the last few centimeters it widens up to 6.02 to improve the accuracy performance of this barrel even more.

The Hopup window is optimized for R-Hop installation and standard hopup design.
This 6.01 precision barrel brings accuracy in Airsoft to a whole new level and is the major reason for the laser shots you’ve seen in my videos.

Spring Guide Stopper

The Spring Guide Stopper has an extended length to prevent the Spring Guide from jamming.
It’s made of tempered 4403 tool steel. With it’s extreme hardness, it can easily handle springs up to 800 fps.


The Sears are milled out of one solid piece of tempered 4403 tool steel. The Trigger Sear is redesigned to handle even greater forces.
The Piston Sear comes with a unique 60° angle which makes for a very smooth and light trigger pull.


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