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View larger RetroArms INOX 0.1 mm hop-up chamber shims are designed to finely move the hop-up chamber away from the gearbox and thereby fine-tune the relative position of the chamber and nozzle. They can help diagnose certain feeding issues and verify the appropriate nozzle length without having to disassemble the gearbox. The package contains 5 stainless steel shims.

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RetroArms CNC hop-up unit M4 / AR15 BASIC in black is designed for AR15-type AEG airsoft guns, such as the M4, MK18, M16 or SR-25. The unit body is made of aircraft-grade aluminium alloy using precise CNC machining. The collet nut ensures precise centering of the inner barrel, while the O-ring at the unit entrance prevents BBs from falling out during...
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RetroArms CNC M4 / AR15 PRO hop-up chamber in black is a precision-machined chamber for AR15 AEG platforms with magazine well height adjustment in 0.2 mm increments. The EN AW 7075 aluminium body is complemented by a collet nut for secure inner barrel mounting and an O-ring that helps prevent BBs from falling out during magazine changes.
RetroArms INOX hop-up chamber shims are a simple service aid for fine-tuning the position of the hop-up chamber relative to the gearbox. Each shim is only 0.1 mm thick and is inserted between the hop-up chamber and gearbox, moving the chamber away from the gearbox by the corresponding distance. In practice, this allows you to adjust the relative position of the nozzle and hop-up chamber without modifying the gearbox itself. The shims are particularly useful when diagnosing and troubleshooting BB feeding issues that may be related to an unsuitable nozzle length. By gradually adding shims, a technician can check whether reducing the effective reach of the nozzle improves feeding and then select a more suitable nozzle length based on the result. They are therefore primarily a tool for precise tuning of the air seal system and feeding, rather than a universal solution to every feeding problem. The shims are made of stainless steel and the package contains a total of 5 pieces.
Each shim moves the hop-up chamber 0.1 mm farther away from the gearbox, allowing its position to be adjusted gradually and in a controlled manner.
Moving the chamber makes it possible to check whether a feeding issue is related to a nozzle that is too long and then select a more suitable length based on the result.
The position of the hop-up chamber relative to the nozzle can be adjusted during diagnostics without having to open the gearbox and replace the nozzle for every test.
The shims are made of stainless steel, providing a solid and dimensionally stable spacer layer between the hop-up chamber and gearbox.
The set is useful for diagnosing BB feeding and tuning the nozzle / hop-up chamber assembly when you need to test positional changes in very small increments.
The shim moves the hop-up chamber 0.1 mm away from the gearbox. This changes the relative position of the chamber and nozzle, which can be useful when diagnosing feeding issues and determining the correct nozzle length.
It can help if the problem is caused by an unsuitable nozzle length or its position relative to the hop-up chamber. Feeding issues can also have other causes, however, so the shim is not a universal solution to every malfunction.
Yes. Each shim is 0.1 mm thick, so adding them allows the chamber position to be adjusted in small increments. After each adjustment, it is advisable to check both feeding and the air seal of the assembly.
Their main purpose is primarily servicing and diagnostics. They make it possible to determine whether changing the relative position of the nozzle and chamber solves the problem without repeatedly disassembling the gearbox, thereby helping with the selection of the correct nozzle length.
| Color | Silver |
| Body/receiver material | Metal |
| Počet kusů v balení | 5 |