The STEELFLY UPGRADE KIT 405 is a modular enhancement set designed to expand the capabilities of the TARGET BOX 404, transforming it into a significantly more versatile and dynamic air rifle target system. By adding interchangeable target components and obstacle modules, it enables shooters to create advanced training scenarios with greatly increased variability and challenge.

The system allows the use of different target sizes, multiple placement positions, and partially or fully obscured target configurations using adjustable obstacle elements. These obstacles can be mounted in various positions within the obstacle area, allowing targets to be hidden, partially covered, or strategically revealed. This creates an almost unlimited number of combinations for target placement, difficulty levels, and shooting exercises.

UPGRADE KIT 405 supports continuous shooting sessions without requiring manual reset after each hit. Targets can be re-engaged repeatedly, enabling fast-paced training and more efficient shooting practice. This makes it ideal for both skill development and dynamic shooting drills.

Key Features

• Expansion kit for TARGET BOX 404 modular system

• Enables use of multiple interchangeable target sizes

• Introduces adjustable obstacle modules for partial or full target concealment

• Highly flexible target placement system with multiple mounting positions

• Creates virtually unlimited combinations of target layouts

• Supports dynamic training scenarios with variable difficulty levels

• Allows repeated shooting without full system reset

• Compatible with HookHole® structure

• Maintains all original TARGET BOX 404 functions

• Designed for fast reconfiguration and continuous training flow

Technical Specification

Size: 16x15x15cm 

TARGET  Hit area: various diameters circles

HIT INDICATOR: Flip up / knock down

CUSTOMIZABLE: Target placement

MAX ENERGY:  25J

MAX CALIBERS: .177 (4.5mm) to .22 (5.5mm)

AMMUNITION: Only lead pellets

SURFACE TREATMENT: Electrochemically Zinc, Black Zinc, Orange paint

IMPACT AREA MATERIAL: 3mm steel

Applications

The UPGRADE KIT 405 is suitable for:

• Advanced air rifle and pellet shooting training

• Dynamic target practice with changing layouts

• Skill progression and reaction training

• Recreational shooting with variable difficulty setups

• Training scenarios with partial target visibility

• Small range and backyard shooting setups (where legally permitted)

Its modular design allows shooters to continuously redesign their training environment, increasing complexity and improving accuracy without replacing the base TARGET BOX 404 system.

Compatibility

The UPGRADE KIT 405 is fully compatible with the STEELFLY TARGET BOX 404 and the STEELFLY HookHole® modular ecosystem.

Compatible with:

• TARGET BOX 404 base system

• STEELFLY interchangeable target plates

• Modular obstacle elements included in the kit

• Most STEELFLY 400 Series accessories

With this upgrade, the TARGET BOX 404 becomes a highly adaptive training platform capable of simulating complex shooting environments and progressively increasing training difficulty.

For detailed product compatibility and configuration options, see the "Upgrades and Compatibility" section.