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I have the same sniper rifle in stock form , shot about 500 rds so far, not real impressed with the hop-up, mine dose work (.020 best), but I need to silicone oil it more than any other air soft I know of.
remove the action from the stock, remove the Bolt/air cylinder out of the receiver, with a flash light, look down the barrel, move your hop-up, should see the little rubber nub in there getting lower or moving back up into the barrel, give a good cleaning, re oil, try again.....
hope this helps
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