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proverbial discord mod wannabe
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The article discusses how altering piston weight and cylinder volumes can make an air rifle more efficient. Curiously, the cylinder volume is decreased, and the piston is lightened.
 

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Yeah, this has been known for a while by most.
What this post proves(already proved) is that piston weighting is sometimes advantageous, and sometimes disadvantageous, which hopefully people will realize.
 

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What isn't comparable is airgun pellet expands with pressure and has quite a bit of friction during the entire travel inside the barrel.
And the HW97 long barrel (competition model) is weaker than the HW97K (hunting model short barrel).
 
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