ZCI 550mm Stainless Steel 6.02mm Inner Barrel

The ZCI 550mm Stainless Steel Inner Barrel is a no-nonsense upgrade component engineered to boost accuracy and consistency in compatible AEGs. Whether you’re fine-tuning a skirmish gun or optimising a DMR build, this tight-bore barrel is a cost-effective way to improve performance without a full gearbox overhaul.

Key Features

• Tight-bore 6.02mm calibre – reduces air loss for consistent FPS and better energy transfer
• Premium stainless steel construction – corrosion-resistant and durable
• 550mm length – suits standard M4, M16, and AK-platform AEGs
• Marui-compatible platform – straightforward drop-in fit for compatible gearboxes
• Improved grouping and accuracy – tighter tolerances mean more predictable shot placement
• FPS boost potential – optimised air compression can yield measurable velocity gains

Real-World Use Cases

Field skirmishers upgrading worn stock barrels will immediately notice tighter groupings at 15–30m. Milsim players running squad support roles benefit from the consistency gain. Budget-conscious builders appreciate the low cost-to-performance ratio compared to full HPA conversions. DMR and precision builds rely on barrels like this as a foundation for sub-1cm groupings at longer range.

Technical Specifications

• Inner calibre: 6.02mm
• Length: 550mm
• Material: Stainless steel
• Bore type: Tight bore
• Compatibility: Marui-compatible AEG gearboxes

Compatibility & Upgrades

This barrel fits standard Marui-clone AEGs and gearboxes using 550mm barrels. Installation requires removal of the front handguard and barrel assembly; no cutting or modification needed. Pair with a quality bucking (rubber) and hop-up unit for optimal results. Works with 0.20g to 0.32g BBs depending on your hop-up setup.

UK Legal & Site Notes

Inner barrels are unrestricted components in the UK. This barrel does not alter legal FPS limits (typically 328 FPS for RIFs on most sites). Always chrono your completed build before play; site limits vary. Check your local site rules regarding barrel length and barrel material.

Invest in precision. The ZCI 550mm stainless steel inner barrel is a reliable upgrade that pays dividends in accuracy and consistency. Add to your basket now.