I got mine slightly used and it would rarely lock back after the last BB. Now after quite a bit of use it locks back more frequently. Here's why I think it works better now:
The spring in the mag is what pushes up the slide lock lever after the last BB. There is also a spring that holds the lever down (located somewhere above the trigger - haven't had to tear my gun completely apart so I don't know exactly where). I think the spring holding it down weakened a bit over time allowing the mag spring to push up a bit harder and catching the slide in time. So I think the only way to fix this problem is some how weaken the spring holding it down.
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