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Is the button (part that is struck) of the main valve sitting flush with the back of the mag...if it's screwed in too much it may not be getting a full strike from the knocker. Same thing happens if your knocker is a touch too short (but there's nothing you can do about that).
Does holding the mag up into the magwell (i.e. with support hand) help at all? Not related to the depth of the mag valve but it tends to identify if there's a seal issue between the top seal of the mag and the nozzle.
Jeez...takes forever to write all this out when it only takes a couple of minutes in person to check...LOL
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