M249 "Big Green" Box Magazine Insert

M249 "Big Green" 4000rnd Magazine Insert

Meet “Big Green” — Bull Craft’s beast-mode M249 insert built for high-capacity dominance. With 4000 rounds packed into a compact 200-round real-steel shell profile, this is the biggest, boldest mag insert we’ve made. Powered by our trusted springless Cattle Drive Feed System, a massive motor with external speed control, and housed in ultra-durable Nylon PA12, this unit is primed for flawless feeding and serious field performance. Designed, printed, and powered in Florida, USA.

This thing isn’t just tough—it’s tactical.

• ✅ Made in the USA
• ✅ Massive Motor w/ External Speed Control – keeps you in the driver’s seat
• ✅ Recommended Power Source: 11.1v LiPo for optimal performance
• ✅ Springless Design for Consistent Feeding
• ✅ Super Durable Nylon PA12 Construction 
• ✅ Comes with Bowden Spring
• ✅ Wiring Diagrams Available
• ✅ Tested with: Titan, Aster, Leviathan, Gate Warfet
• ✅ Superb Support via email, phone, Facebook, Instagram, and in-store
• ✅ Quick Turnaround & Reliable Shipping
• ✅ Actual Availability — No ghost listings

Weight: .5 lb 

Capacity: 4000 rounds (Note: External housing delivers 4000-round capacity while retaining 200rnd shell size)

⚠️ Important HPA Compatibility Notice — READ BEFORE PURCHASE

All Bull Craft drum magazines and inserts require a Trigger Control Unit (TCU) when paired with HPA platforms such as PolarStar or Wolverine.

• Standard FCUs do not provide sufficient power for motor-driven feeding
• With a TCU installed, feeding activates automatically on trigger pull
• Already running an Airsoft Junkiez TCU? You’re good to go — full compatibility confirmed

⚠️ Don’t Be Fooled by Knockoffs

The Cattle Drive™ Springless Clutch Drive Feeding System is often imitated—but never duplicated.

• Designed, refined, and proven in-house
• Built with premium SLS Nylon PA12 and robust motor systems
• Backed by real-world testing, not marketing fluff

Don’t trust your loadout to inferior clones. Choose the original. Choose Bull Craft.