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Old May 19th, 2007, 10:50   #3
mcguyver
 
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Join Date: Aug 2005
Location: Northern Alberta
There is a little selector bar buried underneath the selector lever that is designed to hit pre-indented notches on the frame as the slide moves. This times the opening and closing of the mag valve to control gas flow during full and semi auto fire.

This selector bar has a bad habit of breaking as it's only cast zinc and very small. If you get no fire control at all in either mode, this may very well be the problem.

But it doesn't hurt to take the slide apart and check, just remember where all the little springs and bearing go.
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