RETARMS-01
Hop-Up Chamber for M4
Pairs well with
The Retro ARMS design is very similar to the recent MaxModel chamber design, but significantly more affordable and, in our opinion, with better finishes and higher quality.
Hop-Up chamber for M4-type replicas.
Retro ARMS chambers feature components machined from CNC aluminum EN AW 2007 and EN AW 7075; the adjustment wheel is made of polypropylene. The adjustment mechanism is highly effective because the lever does not bend due to the materials used. Its design allows precise adjustment within a 2 mm range with 0.01 mm increments.
The chamber is 100% compatible with Retro ARMS gearboxes, but also fits standard zinc gearboxes. However, please note we cannot guarantee absolute and perfect fit.
The Hop-Up chamber is equipped with an O-ring to prevent BB drop.
The Hop-Up protrusion is integrated into the pressure lever, ensuring it won't fall out during assembly/disassembly. Optional pressure levers are available for experimental setups.
The chamber surface is anodized in black and red.
Best value-for-quality ratio in our lineup.
Complimentary shipping & returns
Hop-Up Chamber for M4
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Shipping Information
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Customer Support
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FAQ’s
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Contact Us
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FAQs
Please read our FAQs page to find out more.
Do I need an account to order?
No, but an account lets you save addresses, review orders, download invoices and manage wish‑lists.
When will my order ship?
We ship in-stock orders twice a week, on Mondays and Wednesdays. Orders placed Monday or Tuesday leave on Wednesday; orders placed Wednesday to Sunday leave the following Monday. Mainland Spain usually receives them 1–2 business days after dispatch. A tracking e-mail follows automatically.
Can I change or cancel my order?
Yes, e-mail info@skirmshop.es or use the contact form before your order’s shipping day (Monday or Wednesday)
with your order number. After dispatch, changes aren’t possible.
Do you ship outside the EU?
Yes, the shipping rates and import taxes will be calculated at checkout.
What is the minimum age to buy an airsoft replica?
Please check your own governments regulations for the minimum required age.
Don't forget to send your ID.