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Perhaps a better way than changing springs to increase or lower your Spyder or Piranha's velocity is to simply swap the shim
Shocktech is introducing the Shim Kit which will allow Spyder and Piranha owners to adjust their velocity in 10 fps intervals just adding a different colored shim
Kit includes: 6 color coded shims, or spring guides. Each colored shim can be matched with the provided chart to see roughly how your guns velocity will be affected. An inexpensive way to drop or raise your guns velocity instantly.
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