BCI M249 "Big Green" 4000rnd Magazine Insert – MAVERIX Series

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
• ✅ 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

All Bull Craft drum magazines and inserts require a Trigger Control Unit (TCU) when paired with HPA platforms such as PolarStar or Wolverine. Without a TCU, standard FCUs lack power for motor-driven feeding. This applies across our MAVERIX Series—if it runs HPA, it needs a TCU. Already own an Airsoft Junkiez TCU? You’re good to go—our system runs seamlessly with it.

Weight: .5 lb 

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

Built Right. Ready to Fight.