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RetroArms CNC Hop-up Unit AK – Black
RetroArms CNC hop-up unit AK is a precisely machined upgrade part for AK-type AEG airsoft guns. It is made from aircraft-grade EN AW 7075 aluminium alloy and features a 5 µm black protective anodized finish. The collet nut design provides secure and precise inner barrel retention. The unit is suitable for use with V3 CNC gearboxes.
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RetroArms CNC Hop-Up Unit AK
RetroArms CNC hop-up unit is designed for AK-type AEG airsoft guns, with an emphasis on secure inner barrel retention and stable BB feeding. The unit body is made from aircraft-grade EN AW 7075 aluminium alloy on a CNC machining centre and is subsequently finished with a 5 µm black protective anodized coating. The front of the unit features a special collet nut that firmly grips the inner barrel when tightened. The best fit and compatibility are achieved when used with a V3 CNC gearbox. The unit is supplied unassembled and the package also includes an adjustment lever, pressure lever, collet nut, plastic latch and other mounting parts.
Key Features
Aircraft-Grade EN AW 7075 Aluminium
The unit body and other aluminium parts are made from aircraft-grade EN AW 7075 aluminium alloy, combining low weight with high strength.
Precise CNC Machining
The unit is manufactured on a CNC machining centre, allowing precise production of individual parts and correct positioning of the barrel and hop-up components.
Collet Nut for Barrel Retention
The collet nut at the front of the unit firmly grips the inner barrel. Only moderate force is required for tightening – excessive tightening may cause the barrel to rotate inside the unit.
V3 Gearbox Compatibility
The unit is designed for use with V3 CNC gearboxes, to which it can be secured with a screw. It can also be used with standard zinc-alloy gearboxes.
Adjustable Hop-Up Pressure
Hop-up pressure is adjusted by moving the adjustment lever forwards and backwards. The pressure nub is not included and the original one or a suitable silicone or Teflon nub can be used.
Unit Installation and Assembly
- The hop-up unit is supplied unassembled, with the individual parts supplied separately.
- During assembly, the hop-up bucking, inner barrel and pressure nub must be seated correctly.
- A small amount of grease can be used to make installation of the pressure nub easier and temporarily hold it on the pressure lever.
- The RetroArms hop-up bucking does not need to be sealed with Teflon tape because it has sealing ribs on its surface. Technical alcohol can be used to make installation into the unit easier. After insertion, the alcohol evaporates and the bucking remains firmly in place.
- Do not use excessive force when tightening the collet nut.
- Correct tightening can be identified by the reduction of the gap in the collet.
- A CNC support block can be purchased separately to help hold the unit in the gun body and make magazine feeding easier.
Technical Specifications
- Type: CNC hop-up unit for AK
- Unit material: Aircraft-grade EN AW 7075 aluminium alloy
- Manufacturing: CNC machining
- Surface Finish: Black anodizing, 5 µm
- Compatibility: AK-type AEG airsoft guns
- Gearbox: Best suited for V3 CNC gearboxes, also compatible with zinc-alloy gearboxes
- Barrel Retention: Collet nut
- Hop-Up Adjustment: Adjustment lever with forward and backward movement
- Pressure Nub: Not included
Package Contents
- 1× CNC hop-up unit for AK
- 1× adjustment lever made of EN AW 7075 aluminium alloy
- 1× pressure lever made of EN AW 7075 aluminium alloy
- 2× M2.5 × 3 mm screw
- 1× M3 × 12 mm screw
- 1× plastic AK latch
- 1× plastic pin
- 1× rubber O-ring
- 1× collet nut made of EN AW 7075 aluminium alloy
| Variants | AK |
| Color | Black |
| Hop-Up chamber material | Metal |