Double Bell TTI M4 (058M+) with Pre-Installed Wolverine INFERNO Gen 2 Engine & FCU Battery

Building an upgraded competition-style M4 equipped with custom glass, upgraded grips, and an HPA conversion usually involves extensive component sourcing, gearbox modifications, and alignment tuning. The Double Bell TTI M4 Scoped HPA Rifle (058M+) removes all technical friction, coming expert-assembled and powered by the industry-leading Wolverine INFERNO Gen 2 HPA System.

Wolverine INFERNO Gen 2 Engine & Hybrid Technology

At the heart of this custom build lies the Wolverine INFERNO Gen 2, celebrated worldwide for its single-solenoid design and independent nozzle movement. By combining the pneumatic air efficiency of open-bolt mechanics with the feeding accuracy and hop-up seating stability of closed-bolt systems, the INFERNO Gen 2 ensures precise nozzle positioning before every shot. The result is exceptionally consistent shot-to-shot velocity, tight groupings, and maximum gas efficiency out of every tank fill.

Competition Ergonomics, Included Scope & Integrated Spartan Control

The Double Bell 058M+ features a sleek full-metal receiver set, an extended modular handguard, and an ergonomic custom grip designed for enhanced comfort and retention during high-speed drills. Included out of the box is a 1-4x20 variable optic on a dedicated scope mount, allowing operators to seamlessly switch between 1x magnification for CQB room clearing and 4x magnification for mid-to-long-range marksmanship. Controlled via the integrated Spartan Board FCU, players can easily fine-tune dwell time, rate of fire, and burst modes directly through trigger inputs—eliminating the need for external programming boxes or complicated phone apps.

Key Features & Technical Benefits:

• Complete Tactical Package: Factory-included 1-4x20 short-dot scope, scope mount, and custom ergonomic pistol grip.

• Pre-Installed Wolverine INFERNO Gen 2: Premium single-solenoid HPA engine offering superior air efficiency and precision nozzle seating.

• Spartan Board FCU Control: Easily adjust dwell, rate of fire, and burst modes directly through trigger inputs.

• Included FCU Battery: Comes supplied with a dedicated LiPo FCU battery to power internal solenoids out of the box.

• Instant Trigger Response: Solenoid-driven activation completely removes mechanical gear delay for instantaneous shots.

• Extended Modular Handguard: Ample space for mounting tactical lights, lasers, and foregrips.

• Fully Adjustable Output: Easily adjust FPS and rate of fire through your external HPA regulator and FCU parameters.

Tech Installation & Usage Guidance

To set up, connect the included FCU battery to the Spartan Board wiring harness inside the buffer tube or stock compartment. Connect your high-pressure air line (standard QD fitting) to the lower grip line. Set your external regulator within the engine's recommended operating pressure range (typically 60–120 PSI) prior to firing. Always disconnect the FCU battery when storing the rifle to prevent deep battery discharge.