VSR / Striker Spring-to-HPA Conversion

We don't simply install an HPA engine. We design a complete system.

The PRIMOREGGIMENTO.COM HPA conversion service transforms Tokyo Marui VSR, Ares Amoeba Striker and compatible clone bolt-action airsoft replicas into HPA-powered systems through the installation of a Wolverine BOLT-M engine and optimisation of the inner barrel and hop-up assembly.

The objective is to achieve greater shot-to-shot consistency, precise power adjustment and a lighter, smoother cocking action compared with a traditional spring-powered system.

Starting from €500.00 – replica not included.

Features and technical specifications

• Platforms: Tokyo Marui VSR, Ares Amoeba Striker and compatible clones of both platforms
• Wolverine BOLT-M HPA engine
• Complete spring-to-HPA conversion
• ORGA Wide Bore 6.23 mm inner barrel
• Hop-up bucking selected for the configuration
• Complete hop-up assembly servicing and adjustment
• Optimisation of engine, nozzle, hop-up chamber and inner barrel alignment
• Installation of the components required for conversion
• Initial system and operating pressure adjustment
• Configuration optimised for BBs weighing 0.40 g or more
• Power output: below 1 J
• Chronograph checks and functional testing

The Primoreggimento Method

Each conversion is developed around the individual replica, checking compatibility, manufacturing tolerances and alignment to achieve the best possible balance between accuracy, efficiency and reliability.

Compared with a traditional spring-powered system, HPA allows operating pressure adjustment and reduces the effort required to cock the replica. Our reference configuration is primarily designed for heavier BBs, particularly suitable for maintaining stable trajectories at longer distances.

Important information

• The replica is not included in the price.
• The HPA tank, pressure regulator, HPA line and external accessories are not included unless otherwise specified.
• Final compatibility, particularly for VSR and Striker clones, is checked on the actual replica.
• Alternative HPA engines can be requested instead of the Wolverine BOLT-M. The configuration and price are agreed with the customer through a dedicated quotation.
• Any additional components or alternative workshop operations are agreed in advance.
• BBs lighter than 0.40 g can be used, but the reference configuration is designed for BBs weighing 0.40 g or more.

We have been studying and upgrading airsoft replicas since 1997. In 2004, with the establishment of PRIMOREGGIMENTO.COM, this experience became our workshop's everyday work.

The value of the conversion lies not only in the installed components, but in the expertise required to integrate and optimise them as a complete system.