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Tuning Sk-19 leak

When it gets low on air it will fire full auto in semi. It will fail to index and sometimes dump air down the barrel (much more than it should foe a shot).

Fill it to proper pressure.

Check magazine for proper movement. Point in a safe direction and fire 20 shot of air. ( safe direction because there may still be a pellet in the barrel)

If all is well top it off and reload. Shoot a couple of magazines. Check your pressure. Don't let it get low on air. If in doubt refill.

If you adjust the speed wheel all the way high this can also happen.