Impact M3 o-ring kit, what are these two washers/ o-rings?

Bought a o-ring kit to try and solve the first low shot velocities, wondering what these washers/ o-rings are for.

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If you could contact this seller you would find that his o rings do a better job of helping the first shots slow problem
Check out FX Impact M4 - M3 Accu Shot Valve rod o rings New Design on eBay!
 
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