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I learned from another thread this guns parts are proprietary, and upgrading it may not be easy or possible. I have already bought a new spring in hopes of increasing its fps but with the new spring in the piston doesnt even come close to reaching the bolt lock. Is there any fix? I'm not hopeful at this point but if anyone knows I'd appreciate input.
 

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VSR Springs tend to work, but some are thicker than others. For example, my Action Army M150 fit, but not my action army M170. It was just a tad too thick. The gun will also take VSR buckings and hopup arms, and VSR barrels if you file off the small metal protrusions in the chamber that stick into the notches of the barrel. Barrel length should be something like 520 mm.
 
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