CYMA Metal 6-Position Receiver Extension Buffer Tube for CM002 / M4 AEG Series - Black (CM002-BT)

Restore rock-solid stability to your shoulder support or build your dream custom carbine with the CYMA Metal 6-Position Receiver Extension Buffer Tube for CM002 / M4 AEG Series - Black (CM002-BT). Designed as the direct factory replacement buffer tube for the CYMA CM002 M4 series and fully compatible with Tokyo Marui-spec M4/AR-15 AEGs, this heavy-duty metal stock pipe eliminates stock wobble and delivers dependable platform durability under demanding skirmish conditions.

Constructed from high-strength cast and CNC-machined aluminium alloy, the CM002-BT easily withstands the physical abuse of rigorous woodland and CQB environments—including high-speed sling transitions, barrier impacts, and rough kit snagging. The exterior is coated in a durable, non-reflective matte black anodised-style finish designed to resist scratches and match seamlessly with both metal and reinforced nylon-fibre polymer receiver sets.

Along the bottom spine, the extension provides six precisely milled adjustment positions, allowing operators of all arm spans and gear profiles (from lightweight chest rigs to bulky plate carriers) to dial in their optimal length-of-pull with standard crane stocks, CTR-style stocks, or minimalist stocks. The interior channel is optimized for rear-wired Version 2 gearbox setups, offering a hollow pathway that accommodates stick-type and slim nunchuck LiPo/LiFe batteries alongside clean wiring harness routing. A removable threaded rear endcap allows easy access for battery maintenance and wiring checks.

Supplied as a complete, ready-to-fit hardware assembly, the package includes the metal buffer tube, a stamped steel receiver sling endplate, an internal steel tensioning spacer block, and a high-tensile long mounting screw that anchors firmly into the rear spring guide of standard Version 2 gearboxes. Compatible across a wide range of TM-pattern M4/M16 AEG platforms—including CYMA, Specna Arms, G&G, Classic Army, and custom builds—the CYMA Metal 6-Position Buffer Tube is the essential foundation for reliable stock mounting and battery housing.