VSR ZERO upgrade trigger - Gen. 6

SEAR ENGAGEMENT ADJUSTMENT

The sixth generation ZERO Trigger allows adjustment of the engagement depth between the piston sear and the trigger mechanism. By turning the adjustment screw, the overlap of the engagement surfaces can be changed, directly affecting the trigger characteristics.

• SAFE – larger sear overlap providing the highest safety margin.
• SPORT – balanced setting offering a compromise between safety and a shorter trigger pull.
• RISK – minimal sear overlap. Provides the shortest trigger pull but significantly reduces the safety margin of the mechanism.

Unlike most conventional trigger units, the engagement setting can be visually inspected without disassembling the mechanism by using the inspection window located on the top side of the housing.

Warning: Make adjustments only in small increments and thoroughly verify safe operation after every adjustment. Excessively small sear engagement may result in unintended piston release caused by impact, vibration, or forceful bolt closure.

ADJUSTABLE TRIGGER

The trigger position can be adjusted to achieve the ideal placement inside the trigger guard. The trigger slides within a machined slot and is secured by a small hex screw accessible even after the rifle has been assembled.

Smooth forward and rearward adjustment is possible within a range of up to 7 mm. This allows every user to set the trigger position according to hand size and personal preference.

FEATURES AND SPECIFICATIONS:

• The trigger housing is CNC-machined from lightweight yet durable 6061-T6 aluminum alloy.
• Aluminum parts feature a high-quality matte anodized finish.
• The piston sear, lever, and spring guide support are manufactured from steel and heat-treated to a hardness of HRC 28–32.
• The trigger incorporates a ball bearing for a smoother trigger pull.
• Horizontally adjustable trigger with an adjustment range of up to 7 mm.
• New adjustable sear engagement for individual trigger tuning.
• Inspection window allowing visual verification of the engagement setting.
• Internal pins are manufactured from stainless steel.
• A pair of double-torsion springs reliably returns the sear to its default position.
• The trigger mechanism consists of 29 individual components.
• A safety lever is included in the package.
• Tested with springs up to M170.
• Easy installation within minutes.
• Replacement parts available directly from AirsoftPro upon request.
• Each unit is marked with a unique serial number.
• Designed and assembled in the Czech Republic. Selected technical solutions are legally protected.

COMPATIBILITY:

Compatible with:

• Tokyo Marui VSR-10
• JG BAR-10 (Latest production models may use M4 mounting screws instead of M3. Minor modification may be required.)
• Well MB02, MB03, MB07, MB09, MB10, MB11 and other VSR-10 based models
• CYMA CM.701
• CYMA CM.708
• CYMA CM.700 (Safety lever is not compatible.)

Can be used with both original cylinders and reinforced AirsoftPro upgrade components.

Not compatible with MA4401, MA4402, Marui AWS series and similar systems. Also not suitable for M24 rifles.

WHY ZERO TRIGGER?

A durable and reliable trigger mechanism is one of the key requirements for a successful sniper rifle upgrade. Standard trigger units are usually sufficient for stock springs, but the risk of failure increases significantly when stronger springs are installed.

Rifles based on the Marui VSR system use a 45° piston sear design. While adequate for low-powered setups, the loads generated by stronger springs place significantly higher stress on the engagement surfaces.

When the bolt is cocked, the 45° engagement angle tends to lift the piston, causing it to tilt inside the cylinder. This may result in rough bolt operation, accelerated wear, or in extreme cases even unintended piston release.

The AirsoftPro ZERO Trigger utilizes a true 90° (0°) piston sear design, from which the name ZERO is derived. The piston remains properly aligned during cocking, does not tilt inside the cylinder, provides a larger engagement area, and is capable of handling powerful upgrade builds equipped with strong springs.

ZERO Trigger is supplied separately without piston, spring, or spring guide. Before purchasing, please ensure that your rifle uses a piston with a 90° (0°) sear catch.

If you do not already own a compatible piston, it is available separately under product code 6720. Alternatively, you may choose the complete ZERO Upgrade Set, including piston, spring guide, and spring, under product code 18128.