Mancraft CNC Gearbox V2 QSC – 8mm
Build a replica that can handle strong springs, high rate of fire and long bursts without breaking a sweat. The Mancraft CNC Gearbox V2 QSC – 8mm is a reinforced V2 shell made entirely from 7075 T6 aluminium on CNC machines, featuring a quick spring change system and sockets for 8 mm bearings. You get an extremely rigid, precise foundation for advanced AEG and HPA builds – Airsoft use only, this is not a firearm part.
Key features:
- 7075 T6 aircraft-grade aluminium, CNC machined – shell milled from a single block of material, offering very high tensile strength (approx. 570 MPa).
- QSC (Quick Spring Change) system – ball-bearing spring guide with quick access, allowing you to change the spring without fully disassembling the replica. Made from stainless steel.
- Sockets for 8 mm bearings / bushings – stable gear operation in powerful and high-rate-of-fire setups.
- Reinforced front of the shell – reduced risk of cracking in the most stressed area.
- Service and inspection windows – access to the anti-reversal latch and gears, making servicing and diagnostics easier after the gearbox has been assembled.
- Steel thread inserts for the pistol grip screws – significantly increased resistance to thread wear and stripping during frequent servicing.
- Possibility of alignment in the receiver – threaded holes for adjustment screws in the front part of the shell allow you to precisely align the gearbox in the body.
- Colour options – Red / Black / Golden / Blue / Purple – perfect for custom builds and matching other Mancraft CNC parts.
- Designed and manufactured 100% in Poland / EU – a shell created specifically for Airsoft, with heavily tuned replicas in mind.
- Covered by the Mancraft Lifetime Warranty programme.
Box contents
- 1× Mancraft CNC Gearbox V2 QSC – 8mm shell
- 1× stainless steel spring guide with Quick Spring Change (QSC) system
- 1× set of mounting screws and pins
Compatibility and notes
- Platform: most AEG replicas based on a standard V2 gearbox (including M4/M16/AR15 and their clones).
- Use: AEG and HPA conversions using a V2 shell as a base (compatibility of the motor / controller / HPA engine must be verified individually).
- Not intended for: replicas using V2 Long / V2.5 (SR25 etc.) or GBBR platforms.
- Requires advanced installation: we recommend assembly by an experienced AEG/HPA technician.
- Do not use shortened cylinder heads with a rubber bumper at the front. They can damage the gearbox shell and are not covered by the warranty. The reason is simple: the cylinder head has no proper surface to rest on, and every shot is transferred through the pins centering the cylinder head.
- We recommend purchasing pistol grip shims – they let you adjust the grip’s distance from the shell, making it easier to set the motor correctly and achieve a clean, smooth sound of the drive train.
Specifications:
- Type: V2 gearbox shell
- System: QSC – Quick Spring Change
- Material: 7075 T6 aluminium, CNC machined, anodised finish
- Bearing size: 8 mm
- Weight: only 165 g (including the full screw set and spring guide)!
- Colours: anodised Black, Red, Gold, Blue and Purple
- Intended use: Airsoft only (AEG/HPA replica part, not a firearm component)
Installation (general / simplified guide – advanced service recommended)
- Make sure the replica is unloaded and disconnected from any power source (battery / HPA air supply).
- Disassemble the replica, remove the complete old V2 gearbox from the receiver and take out all internal components (gears, cylinder, piston, trigger, electrics).
- Transfer all internal parts into the Mancraft CNC shell, choosing appropriate 8 mm bearings/bushings and shimming the gears correctly.
- Install the QSC spring guide and the rest of the components, then check the mechanism “dry” (without the main spring), using the inspection windows.
- Fit the gearbox into the receiver, adjust its position with alignment screws (if used) and grip shims so that the motor runs quietly and without excessive resistance.
- After fully assembling the replica, perform a series of tests in a safe area, checking sound, feeding and FPS stability.
- Tip: if the sound of operation is unnaturally sharp or “rough”, go back to the gear shimming and motor height adjustment – the Mancraft shell very precisely transmits any assembly errors.
Why choose the Mancraft CNC Gearbox V2?
- Designed for strong springs – 7075 T6 alloy and the reinforced front section of the shell are built with demanding tuning setups in mind.
- Tuner-friendly servicing – inspection windows, QSC and the ability to align the shell in the body make working on AEG and HPA builds much easier.
- CNC precision – consistent dimensions, better fit with the receiver and lower risk of stress points that kill stock shells.
- Looks and personalisation – multiple colours let you create a visually cohesive showcase build, not just a “hidden” upgrade.
- Polish engineering – developed by a company specialising in Airsoft AEG/HPA systems, with extensive experience in real-world replica tuning.
- Covered by the Mancraft Lifetime Warranty programme.
FAQ
Will this gearbox fit my M4/M16 AEG?
It is a standard V2 shell, compatible with most M4/M16/AR15 replicas based on V2. Due to differences between manufacturers (e.g. non-standard receivers), it is always worth checking your replica’s specification or consulting installation with a service technician.
Can I use 8 mm bearings and bushings from any brand?
Yes, the shell has sockets for 8 mm – you can use both bearings and bushings from reputable manufacturers, as long as you install them correctly and shim the gears properly.
How strong a spring can I use?
The shell is made from 7075 T6 alloy with high strength, designed for heavily loaded setups. The real limit, however, depends on build quality, chosen parts and correct AOE setting – for extreme tuning we recommend consulting an experienced technician. (We have seen setups running springs as strong as M190 ;) )
Is this gearbox suitable for HPA?
Yes, it is an excellent base for HPA conversions, as long as the chosen HPA engine / insert is compatible with a V2 gearbox. Installation requires experience and often minor fitting – especially in non-standard replicas. However, we recommend our EHPA gearbox - cheaper and dedicated to solenoid engines
Is this a firearm part?
No. This is a component designed exclusively for Airsoft AEG/HPA replicas – it is not compatible with any real firearm or GBBR system.
Instead of standard alloy threads for handgrip, we equipped our gearboxes with stainless steel inserts.
For correct Angle of Engagement we added up long hole at left side of gearbox shell
For side to side gearbox alignment in body, you can use two front screws.
To make gearbox most durable, we added up material at the front end where gearbox is most sensitive to cracks.
For gear setup, you can use spot holes for every gear
In addition to make assembly easier, we provide our gearbox shells with Quick Change Spring Guides
Warning - do not use shortened cylinder heads with a rubber bumper on the front. These can damage gearbox shell and its not covered by the guarantee. The reason for that is simple: theres no surface for cylinder head to lay on and every shot is trasfered via cylinder head centering pins.
