Trouble with the slide lock might be caused by the
magazine follower. Can't see the pistol from here,
but there's likely a recessed lip on the mag follower
that presses upward on the slide lock mechanism,
after the last round is fired.
You can see how it operates by looking inside the chamber
while inserting an empty magazine. Sometimes you can
'tweak' the follower lip to make it engage the slide
lock better. Takes patience to get it right, though...
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