Blowback Mechanics

In blowback based markers, the bolt and striker (or hammer) often form a unified moving assembly within a single tube. When the firing sequence begins, the striker moves forward under spring tension and opens a valve, allowing gas to accelerate the paintball. Some portion of the gas or resulting pressure reaction acts on the bolt and striker, driving them rearward once the initial forward motion is complete.

Return springs then push the assembly forward again to its resting position, preparing the marker for the next shot. The timing of this cycle depends on the mass of the moving components, the stiffness of the springs, and the magnitude of the gas impulse. Because the same assembly is responsible for both valve actuation and bolt motion, blowback designs can be relatively compact and mechanically straightforward.

Blowback mechanics differ from systems that employ separate pneumatic rams, multi stage regulators, or electronically controlled solenoids. Nonetheless, the same underlying concepts of pressure, acceleration, and valve control apply. Variations within blowback platforms include differences in how gas is routed, how the feed stack is managed, and how return forces are balanced.