Wolverine BOLT HPA Engine - VSR-10 and Bolt Action Sniper Rifles

A spring sniper is only ever as consistent as its spring, and a spring is a component that changes. It settles when new, weakens across a season, and behaves differently at eight in the morning than at three in the afternoon. For a discipline where one shot has to count, that is the wrong thing to be relying on.

The BOLT replaces the spring and piston with regulated air, and the shot-to-shot consistency that follows is the entire point. Set your pressure, chronograph once, and the rifle delivers that velocity for as long as you feed it air.

Three things make it unusual among HPA systems. It is electro-pneumatic with no FCU — a small battery and a trigger switch mounted outside the trigger box power the valve directly, which means solenoid consistency without the complexity or battery drain of a fire control unit. During the shot itself nothing moves except the solenoid valve, which is why it is intrinsically quiet in a way a spring rifle simply cannot be. And Wolverine's patent-pending Air Saver technology matches air volume to your barrel, saving up to 50 per cent of the air per shot.

Removing the spring changes how the rifle handles as well. Cycling the bolt no longer means fighting a heavy spring, so you can work the action while staying on target through the scope — and a follow-up shot becomes realistic rather than theoretical.

It runs on 80 to 180 PSI and produces 1 to 3 joules depending on setup and BB weight, so it covers everything from a site-legal skirmish rifle to a high-power DMR build. It is also compatible with Wolverine's WRAITH CO2 stock system if you would rather run self-contained with no external line.

Specifications

Good to know before you buy

Cylinder compatibility is the thing to get right. A Tokyo Marui VSR-10 requires the Wolverine cylinder; a JG Bar-10 does not, though it is recommended; and an Echo1 M28 is not compatible with the Wolverine cylinder and must use its stock one. Many rifles are advertised as “VSR compatible” while differing in ways that matter here — send us your exact make and model and we will confirm before you order. You will also need a tank, a regulator, a line and a 7.2V LiPo, none of which are included.

Frequently asked questions

Which rifles does it fit?
Tokyo Marui VSR-10 in Pro and G-Spec, Echo1 PSR, JG Bar-10, Echo1 M28 and the Cybergun FN Herstal SPR are the confirmed platforms. Plenty of other rifles claim VSR compatibility but differ in small ways that matter — check with us first.

Do I need the cylinder as well?
It depends on the rifle. The TM VSR-10 and Echo1 PSR require it. The JG Bar-10 and Cybergun SPR do not, though it is recommended. The Echo1 M28 is not compatible with it and uses its stock cylinder. Tell us your rifle and we will specify the right variant.

Does it need an FCU?
No, and that is deliberate. A small battery and an external trigger switch fire the valve directly, giving solenoid consistency without an FCU's complexity or battery drain.

Is it really quieter than a spring rifle?
Yes. During the shot nothing moves inside except the solenoid valve, so there is no spring noise and no piston slap — which for a sniper is worth as much as the consistency.

What is Air Saver technology?
It matches the volume of air released to your barrel length, so you are not spending air the barrel cannot use. Wolverine rate it at up to 50 per cent saving per shot, which is a great many more shots per fill.

Can I run it without an air line?
Yes, with Wolverine's WRAITH CO2 stock system, which is self-contained and does around 150 shots per cartridge at over 2 joules.

What FPS will I get?
It produces 1 to 3 joules depending on your regulator setting, barrel and BB weight, so it covers site-legal skirmish through to high-power DMR. We chronograph and set it as part of fitting.