Bolt Spring
Overview
The bolt spring is the mechanical component that returns the bolt to its rearward resting position after firing in spring-based or hybrid marker designs.
Key Points
- Provides mechanical return force after a shot.
- Used in mechanical or hybrid bolt systems.
- Spring tension affects timing and reliability.
- Must be matched to marker design specifications.
- Wear can cause misfeeds, sluggish cycles, or bolt stick.
Details
The bolt spring is a return mechanism found primarily in mechanical markers and some early electronic hybrids. After the bolt moves forward to chamber and fire a paintball, the spring forces it back to its initial position. Proper spring tension ensures consistent cycling, reliable feeding, and stable shot timing.
Over time, springs fatigue, deform, or accumulate debris, reducing efficiency. A weakened bolt spring may cause bolt stick, incomplete resets, or double-feeds. Conversely, an overly stiff spring can reduce air efficiency or increase mechanical wear. Manufacturers specify exact spring tensions to balance responsiveness and operational smoothness. In modern spool-valve systems, pneumatic return systems have largely replaced physical bolt springs, but the concept remains part of core marker mechanics.
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