mike2089 Posted December 18, 2013 Share Posted December 18, 2013 Hi, I am totally new to Benelli and semi-auto shotguns, so bare with me. I bought a M4 and have not shot it yet. My question is; are the gas pistons supposed to loosely move forward and back freely when you tilt the gun vertical and back. I can hear and see them move forward and back with bolt open. They protrude out the receiver a bit. The issue is it makes an annoying sound as they click back and forth when you turn the gun so gravity drops the piston into the receiver and back. I would somewhat expect the piston to move when the bolt is open, it is supposed to move so loosely. If I load a (practice) round into the chamber and lock the bolt, I can still hear the pistons moving back and forth as I tip the gun while not as prevalent as they contact the bolt but they still move back and forth and I can hear them slide. . I though the piston would sit tight against the bolt when closed and not be able to hear it move back and forth. I just want to ensure that is an expected behavior. Thanks.. Quote Link to comment Share on other sites More sharing options...
Sukhoi_fan Posted December 18, 2013 Share Posted December 18, 2013 Expect that, everything is as it should be on your M4 from your description. Quote Link to comment Share on other sites More sharing options...
BLACK Posted December 19, 2013 Share Posted December 19, 2013 Hi, Are the gas pistons supposed to loosely move forward and back freely when you tilt the gun. Thanks.. Yes. This is normal. They are free-floating i.e. no spring in there. Like an AR firing pin Quote Link to comment Share on other sites More sharing options...
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