New S&W MP9 question

Anyone who has a MP9, can you tell me if there is suppose to be a screw in the rear sight hole (top center)? I just bought one for my wife, and didnt see one in mine at the store when i bought it, and was told there isnt one in them, but the hole has threads? I dont have the gun here yet, but want to know if it was missing or not

Thanks

Andy
 
yup set screw in mine too. But if it comes out it's not a big deal the dovetail should be tight enough.
 
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