Airsoft GI Custom Brimstone M4 AEG Airsoft Rifle

Durable Proline Construction

The Airsoft GI Custom Brimstone is built on the Lancer Tactical Archon Proline M4 platform, featuring full metal receivers, handguard, and outer barrel for rugged realism paired with a lightweight polymer Delta stock and motor grip. Shooting at 370–380 FPS with .20g BBs, the reinforced Version 2 gearbox, 25k high speed motor, and steel internals deliver long-lasting reliability and smooth performance in a compact 9-inch M-LOK setup. Weighing only 4.5 pounds and adjustable between 26 and 29.5 inches, this rifle balances strength and maneuverability for both indoor and outdoor play.

Precision Upgraded Internals

The Brimstone build comes loaded with performance upgrades to give players a competitive edge. A Maple Leaf 6.02mm inner barrel, Super Macaron bucking, and Maxx CNC hop-up chamber maximize accuracy and consistency. SHS 13:1 steel gears, reinforced piston, and a Solink brushless motor combine for fast, reliable cycling. The Titan V2 Expert Module offers unmatched trigger tuning and firing mode customization, making this rifle a high-performance platform tailored for serious players.

Tactical Enhancements and Accessories

Externally, the rifle is outfitted with an Atlas SOCOM QD barrel extension for a suppressor-style look, Atlas BCM vertical grip, and Ranger Armory M-LOK rail covers for enhanced handling. Optics are handled by an Atlas solar-powered red dot with killflash on a Unit Lite mount, while an ACW LA-5 PEQ15 with IR laser and a pressure switch rail mount add tactical versatility. Packaged with a Code 11 36-inch rifle bag, the Brimstone is fully field-ready for players who demand both style and performance in one compact rifle.

Specifications

• Brand: Airsoft GI
• Model: Custom Brimstone M4
• Base Model: Lancer Tactical Archon Proline M4 AEG
• Muzzle Velocity: 370–380 FPS
• Package Includes: Gun (as pictured), magazine, gun bag
• Weight: 4.5 lbs
• Color: Tan

Features

• Full metal receivers and 9-inch M-LOK handguard for realistic build quality
• Lancer Electric Trigger Unit with cutoff system for crisp response and accuracy
• Reinforced V2 gearbox with steel gears, steel teeth piston, and 25k high-speed motor
• Quick-change spring system for indoor and outdoor tuning
• Full-length 20mm top rail for optics and accessories
• Flip-up front and rear sights with quick deploy release
• Delta stock with lightweight design and rubberized buttpad
• Atlas SOCOM QD barrel extension for suppressor look
• Atlas BCM vertical grip and Ranger Armory M-LOK rail covers for improved control
• Atlas solar-powered red dot with killflash and ACW LA-5 PEQ15 with IR laser included
• Upgraded internals: Maple Leaf barrel/bucking, Maxx CNC hop-up, SHS gears, Solink motor, Titan V2 Expert Module
• Packaged with Code 11 36-inch rifle bag