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CYMA Metal 6-Position Receiver Extension Buffer Tube for CM002 / M4 AEG Series - Black (CM002-BT)
Upgrade your rifle’s rear stability and stock customisation with the CYMA Metal 6-Position Receiver Extension Buffer Tube for CM002 / M4 AEG Series - Black (CM002-BT). Precision-engineered from heavy-duty cast and CNC-finished aluminium alloy, this stock tube provides a solid foundation for standard retractable AR-15 buttstocks.
Featuring six laser-etched or indexed adjustment positions, it enables fast, tailored length-of-pull settings for different body armour setups. The hollow design accommodates slim buffer-tube-style stick LiPo batteries and wiring harnesses. Supplied with an internal retaining plate and mounting bolt, it is ideal for TM-spec M4/AR-15 electric airsoft rifles.
When converting a fixed-stock rifle into a modern tactical carbine, replacing a cracked plastic receiver extension, or tightening up rear-end wobble, the CYMA Metal 6-Position Receiver Extension Buffer Tube (CM002-BT) offers a dependable, workshop-grade solution. Built to original factory specification for the CYMA CM002 series and compatible with broad Tokyo Marui-spec AR platforms, this component delivers the rigidity required for aggressive field skirmishing.
Heavy-Duty Aluminium Construction & Zero Wobble Crafted from high-grade aluminium alloy and finished in a resilient matte black powder-coat anodised finish, the CM002-BT resists bending, impact damage, and surface scratching. Unlike entry-level polymer stock tubes that flex under heavy shoulder transitions or break during sling tugs, this full-metal tube provides a secure anchor directly into the lower receiver's stock tang. Precision machining ensures that aftermarket retractable buttstocks slide smoothly along the tube while locking positively into detents without excessive lateral rattle.
Six Length-of-Pull Positions & LiPo Battery Housing The tube features six distinct adjustment stop positions along its underside track, allowing players to dial in their optimal length-of-pull in seconds—whether wearing low-profile chest rigs or thick plate carriers. The hollow internal cavity is designed to double as a concealed battery compartment, providing ample clearance for 7.4V or 11.1V stick-type LiPo batteries, low-resistance silver wiring, and compact fuse assemblies. A removable rear end cap makes wire routing and battery access quick and straightforward between games.
Practical Applications & Real-World Use Cases
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Stock Conversion & Modernization: Convert fixed-stock M16 or solid A2-style rifles into modular, adjustable carbines to suit compact transport and dynamic CQB gameplay.
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Wobble Elimination: Eliminate sloppy stock movement on worn builds by replacing degraded factory buffer tubes with a rigid, true-spec metal extension.
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Internal Battery Storage: Protect and hide delicate battery packs and wiring harnesses safely inside the receiver extension rather than resorting to external battery PEQ boxes.
Compatibility
Designed for Tokyo Marui-spec M4, M16, and AR-15 series Airsoft Electric Guns (AEGs), including CYMA, Specna Arms, G&G, Classic Army, and APS platforms utilizing standard rear receiver tangs. Supplied complete with the internal metal locking plate, lock washer, and long central receiver fixing screw for straightforward installation.
| SKU | 616558 |
|---|---|
| Brand | Cyma |
| Weapon Category | Parts |
Our courier partners deliver from Monday to Friday, excluding Bank Holidays. We will attempt to dispatch all packages within 24 hours, although at peak times this may take slightly longer. Orders with products with two-tone service or Defence Check may take longer to dispatch.
Once the order is dispatched you will get an email with the tracking number and which courier partner it’s going to be delivered via. Any missing/incorrect items need to be reported with 48hrs of signed delivery.
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Faulty Product?! Unfortunately that is part of life but be rest assured we are here to help! Contact one of our friendly staff via phone or email. Stating what the problem is, if we can resolve the problem via phone or email great if not then they will advise how to send it back and what details we require.
The gun will be sprayed 51% in a bright/primary color (we do only blue, green and red currently). The process of two toning currently runs at 2 working days depending on Drying Time, which is effected by Ambient Temperature and Weather. and currently no express delivery is available for this even if you select it at checkout.