Specna Arms S-Mag 380rnd High-Cap Magazines for M4/AR-15 AEGs 5 Pack

The Specna Arms S-Mag 380rnd High-Cap 5-Pack is a high-volume magazine solution designed to provide sustained firepower for M4 and AR-15 series AEGs. Featuring the iconic textured "S" pattern for maximum grip, these magazines are the perfect choice for support players and those who prefer to keep their focus on the objective rather than frequent reloads.

Reliability meets capacity in the S-Mag High-Cap. While many high-capacity magazines suffer from poor feeding or flimsy internal winding mechanisms, Specna Arms has engineered these with a robust internal clock-spring system that ensures a steady stream of BBs even during long bursts of suppressive fire.

Core Specifications & Performance

• 380-Round High-Capacity Reservoir: Offers a massive ammunition count per magazine, allowing you to dominate lanes and suppress enemy positions for extended periods.
• Signature S-Mag Texture: The raised Specna Arms branding provides a non-slip surface, ensuring positive indexing and fast magazine changes in the heat of battle.
• Durable Polymer Body: Constructed from a high-grade, impact-resistant polymer that balances lightweight portability with the ruggedness required for field use.
• Easy-Winding Bottom Wheel: Features an oversized, textured winding wheel at the base for quick tensioning, even while wearing thick tactical gloves.
• Wide-Mouth Fill Hatch: The top-loading trap door is designed for fast refills in the field, compatible with most standard BB bottles and speedloaders.

The "Pro" Take

In our technical workshop, the S-Mag High-Cap is often our go-to recommendation for players who are just starting out or those acting as squad support. The 5-pack offers incredible value, giving you nearly 2,000 rounds of total capacity across your rig. While MilSim purists often prefer mid-caps, there is no denying the "force multiplier" effect of a high-cap in a frantic CQB skirmish. These mags feed exceptionally well across various brands, and the polymer construction means you aren't adding unnecessary weight to your loadout.

UK Spec & Site Performance

On the UK airsoft circuit, the High-Cap S-Mag is a staple at "Open Day" skirmishes and high-intensity CQB sites. Whether you are holding a defensive line in a damp woodland site in Kent or pushing a corridor in a dark urban arena in Manchester, having 380 rounds at your disposal is a massive confidence booster. The textured grip is particularly useful in the UK's famously wet climate, preventing the magazines from slipping when your hands are cold or damp. These magazines are fully compatible with any RIF (Realistic Imitation Firearm) tuned to the standard UK limit of 350 FPS, providing consistent feeding that helps maintain your muzzle velocity and site-legal status.

Friendly FAQ

Do I need to wind these magazines?
Yes, as these are high-capacity magazines, you will need to occasionally turn the wheel at the bottom to tension the internal spring and feed the BBs into your rifle.

Will these fit in standard M4 mag pouches?
Absolutely. Despite their high capacity, they maintain the standard 5.56mm STANAG dimensions, fitting perfectly into the Specna Arms pouches or the Delta Fast Mag systems.

Are these compatible with Tokyo Marui-spec rifles?
Yes, the S-Mag follows the standard Tokyo Marui fitment, making it compatible with G&G, Cyma, Specna Arms, and most other M4 AEG platforms on the market.

How many BBs should I load into the reservoir?
You can fill the reservoir to its 380-round limit, but we recommend leaving a tiny bit of space to ensure the trap door closes securely and the internal winding mechanism has room to move freely.