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it's probably the trigger bar. Since you've taken the lower half of the gun apart, this shodul be pretty easy for you to do.
you need to bend the rear section of the trigger bar downwards slightly. To find out how much remove the slide then press the trigger just slightly as to not fire the hammer. push the nib on top of the trigger bar that is beside the hammer down. this will dis-engauge the trigger from the hammer. the distance this nib has to move for the gun to fire semi auto is very little. if the nib or the slide is worn then the nib won't press down and the sear will not lock onto the hammer when you pull the trigger so you'll get full auto.
the trick is to bend the trigger bar just after the bend where the large square outline goes beside the hammer. bend the trigger bar with pliers *slightly* downwards such that the nib on the back of the large square of the bar is pointing downward. remember the word *slightly* means exactly that .. its a very very small ammount, too much and the gun won't work, too little and your still left with full auto. I'd have to say you need to use "finger tight" presure when you bend with pliers to give you an idea of how much force is required.
to test .. pull back the hammer, pull the trigger a bit and push down on teh trigger bar .. idealy you would want the bar to release the sear that holds he hammer so that the hammer stays in place with the trigger bar being moved downward about 0.5 - 1mm *very little effort*
hope this helps.
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