Sig Mosquito Slide won't drop?

[UFO]

I am a relative newbie, but... I have successfully taken down and cleaned my Sig Mosquito a dozen times. And tonight it wont go back together. Well it does, but the slide won't drop.

Not that many parts involved. Ideas? Help hints?

Much appreciated.

UFO

 

[kendall-op]

If the slide won't close or doesn't go forward hold the hammer down. Mine you have to hold the hammer down to get the slide to move shut. I hope this helps.