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Yes the air nozzle should be the same as all the sig series rifles (550,551,552,etc) cylinder head should be a CA type v3 ( flush front no key). The best way to check bushing size is to pull that mechbox out and check what size of bushing you have ,my best guess would be 6mm.
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All right, they're on our left, they're on our right, they're in front of us, they're behind us... they can't get away this time!
- Lieutenant General Lewis B."Chesty" Puller (when surrounded by 8 enemy divisions)
Born to fight, trained to kill, ready to die, but never will.
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