If you put the magazine into the gun with the upper half OFF, you should see the hold-open bar raise up a bit just as the mag. locks into place on top. The button on the magazine is what pushes it up. You'll be able to see if the mag. raises the lever. If not try a different magazine as your hold-open lever appears intact.
It's a nice gun, collectible and correct, and you're doing well.
dju
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