Double Bell BY-058 - M4A1 AEG Rifle Key Mod Rail in Black

Double Bell BY-058 - M4A1 AEG Rifle Key Mod Rail in Black

The Double Bell BY-058 M4A1 AEG Rifle in Black is a rugged and reliable addition to any airsoft arsenal. Designed with both performance and realism in mind, this full-metal airsoft rifle delivers solid out-of-the-box accuracy and durability, making it an excellent choice for both new players and experienced skirmishers. With a modern KeyMod rail system and tactical enhancements, this AEG offers versatile customization and field-ready function.

The standout feature of the BY-058 is its KeyMod RIS/Picatinny handguard. This allows for the quick and secure attachment of accessories like grips, lasers, and flashlights—tailoring your loadout to the needs of any mission. The rifle also features a steel silencer mounted on a 14mm CCW thread, giving it an aggressive, stealth-inspired look while allowing compatibility with a wide range of barrel extensions and suppressors.

This airsoft rifle features a functional bolt catch, a handy detail that locks the bolt back for easier hop-up adjustment. Inside, the rotary hop-up chamber is easy to fine-tune and pairs with the precision 6.03mm tight bore inner barrel to improve accuracy and range, even in demanding field conditions. Whether you're clearing rooms or covering long sightlines, the BY-058 is built to perform.

At the heart of the rifle lies a durable Version 2 gearbox running on 7mm bearings. The internal construction is robust and designed to handle upgrades if needed. The integrated quick-change spring system is a major bonus, letting you adjust FPS levels without a full teardown—perfect for adapting to different site limits or indoor/outdoor play.

The BY-058 is built primarily from metal, giving it a solid, realistic feel. Polymer is used only where it makes sense for weight savings and ergonomics, like the pistol grip. Steel parts, including the muzzle device, bolt feeder, screws, and magazine, add to its durability and long-term reliability under regular use.

The adjustable length stock allows players of all sizes to comfortably shoulder the rifle, and it includes QD sling mount slots for convenience during long matches. Folding flip-up iron sights come pre-installed, but you can easily swap them out or pair them with optics for enhanced aiming capability.

This AEG comes with a steel high-capacity magazine holding 300 rounds, ensuring you’ve got plenty of firepower on hand. Please note that the set does not include a battery or charger, so be sure to pick those up separately for immediate use. Also, the replica does not feature the licensed trademarks or logos shown in some promotional images.

Highlights

• Metal construction with polymer pistol grip
• KeyMod rail system with Picatinny compatibility
• Functional bolt catch for easy hop-up access
• Rotary hop-up and 6.03mm precision inner barrel
• Quick-change spring system for FPS adjustments
• Durable V2 gearbox with 7mm bearings
• Steel silencer on 14mm CCW threaded barrel
• Folding flip-up sights and adjustable stock

What's Included

• Double Bell BY-058 M4A1 AEG Rifle
• 300-round steel hi-cap magazine
• User manual

Technical Specifications

• Model: BY-058 M4A1 AEG
• Manufacturer: Double Bell
• Power Type: AEG (Electric)
• Gearbox: Version 2 with 7mm bearings
• Inner Barrel: 6.03mm tight bore
• Hop-Up: Rotary, adjustable
• Length: Full-scale rifle
• Construction: Metal with polymer grip
• Magazine Capacity: 300 rounds (Hi-Cap)
• Threading: 14mm CCW