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Disassemble the slide and inspect the blowback unit.
Disassemble and take off the blowback unit that houses the nozzle. Is the piston inside okay?
I've experienced this before when an off-spec piston head o-ring was getting caught on the nozzle upon returning to battery.
I'm curious... I know the inner barrel shouldn't affect the cycle although it is outrageously long... could you try racking it without the inner barrel?
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