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Help on my M4 pistons move


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Hi guys i just got me m4 last week shoots good..well i took it apart last night and its making some noise ..the 2 pistons on the front move front and back freely the black ones that go into the silver cylinders..are the black pistons supposed to move like that ..i didnt hear them move like that when i got my m4 or even after i shot it the first time..any info would be great ..

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