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It sounds like it may be a problem with the sears. Normally when the internal hammer strikes the gas valve, it locks down against the magazine valve and stays there until the rearward movement of the slide trips a sear. When the slide trips the sear, internal hammer resets and the gas valve is shut off.
In the event of the internal hammer not locking down (or somehow getting tripped really, really prematurely), it'll still strike the gas valve and release some gas, allowing the BB to be fired. However, the hammer resets before enough gas is released to complete slide cycling.
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