M4/AR15-AEG'er med standard V2-gearboks. Motor og gearing beholdes, medmindre du vælger varianten med 18:1-gearsæt.
Basic Build Kit for M4 AEG (V2 Gearbox)
Den billigste vej til en holdbar AEG: metal-stempel, alu-stempelhoved, cylinderhoved, fjederstyr og fjeder. Motor og gearing beholdes – valgfrit med 18:1-gearsæt.
Site limit: FA ≤ 129,9 m/s
Cheaper than buying the 5 parts separately.
In stock in Aulum, Denmark – 4 sets
Cheaper than buying the 7 parts separately.
In stock in Aulum, Denmark – 4 sets
Fitting costs a fixed 500 kr and is paid together with the kit. Turnaround is 2–3 weeks from when we receive your gun. If any of your gun's original parts are worn, we'll contact you before replacing anything.
- 2-year warranty on new parts
- Chronograph reading in m/s when fitted
What's in your kit
Click a part to read more about it.
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PartBalystiK 14-Tooth Piston
89 kr
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PartGuarder Aluminium Piston Head, V2/V3
139 kr
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PartCylinder Head Ver. 2
79 kr
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PartSpring Guide Ver. 2
89 kr
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PartSpring, M100
29,75 kr
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PartBalystiK 14-Tooth Piston
89 kr
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PartGuarder Aluminium Piston Head, V2/V3
139 kr
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PartCylinder Head Ver. 2
79 kr
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PartSpring Guide Ver. 2
89 kr
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PartSpring, M100
29,75 kr
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Gear setBalystiK CNC 18:1 Gear SetSets rate of fire and load – matched to the motor and spring
199 kr
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PartShims, 9 pcs of 0.10, 0.15, 0.20 mm
39 kr
How fitting works
Turnaround is 2–3 weeks from when we receive your gun.
- Order the kit and fittingEnter your gun model and gearbox, and tick the box about the right of withdrawal.
- Drop off or send your gunAt our shop in Aulum, Denmark, or with a shipping label. Return shipping is free.
- We build and measureShimming, AOE, lubrication, chronograph reading in m/s with your BB weight, and test firing.
- Get your gun backFixed price 500 kr, paid when you order. We return it free of charge, or you can collect it from the shop.
About the kit
The Basic kit for M4 is the most affordable route to a more durable and consistent AEG. The kit replaces the V2 gearbox parts that most often break or wear in a standard AEG – piston, piston head, cylinder head, spring guide and spring – without touching motor or gearing. If you choose the variant with gear set, you also get a BalystiK CNC 18:1 gear set and shims.
Stripped piston teeth and a cracked piston head are the most common reasons a standard AEG stops working on the field. The kit addresses exactly those two things and also improves the air seal, so velocity is more consistent from shot to shot. The motor is not included – it adds the most to the price without making the gearbox more durable. If you want a higher rate of fire, see our All-Round kit.
The parts that give the most for the money
- Piston with 14-tooth metal rack: The body is PA66 polymer, and the tooth rack is metal all the way. An all-plastic piston is the typical weak point in a standard gearbox.
- Guarder aluminium piston head: An aluminium piston head withstands the impact against the cylinder head better than a standard plastic piston head.
- SHS cylinder head for V2: A new cylinder head with O-rings gives a tight seal to the cylinder, so compression is not lost and velocity becomes more consistent.
- PPS spring guide for V2 and M100 spring: The spring guide keeps the spring straight during compression, and the new spring gives a known force instead of a tired stock spring.
- Optional BalystiK CNC 18:1 gear set with shims: The standard ratio in CNC steel lasts considerably longer than most stock gears. The gear set requires shimming, so we recommend having it fitted in the workshop.
Maintenance and safety
- Fitting requires disassembly of the gearbox, shimming and correct lubrication. If you haven't done it before, we recommend having it fitted in our workshop
- Always measure velocity with a chronograph after fitting, and stay within the site's limits for your type of replica
- Use an 11.1 V LiPo battery with a suitable discharge rating, and always charge with a balance charger in a LiPo safety bag
- Inspect the gearbox after a season with many game days
- Always wear approved eye protection during play and testing
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Basis AK
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Highspeed M100 – kun fuldautomatisk
Ren fuldauto-build med høj kadence.
Hank explains
Short videos about the parts in the kit.
1:18
1:36
