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how to identify an open bolt vs. a closed bolt tec 9 and m-11

Pavnman

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hello everybody. I have a friend who has a pre ban tec 9 and m-11. im trying to identify if they're open or closed bolts. is there a prefix to the serial numbers? Or other identifying marks? thanks for any and all input.
 
Not "open bolt" guns then... the whole deal with them is that the bolt is open all the time when it's ready to fire. The trigger literally releases the bolt (which has a fixed firing pin on the face), the bolt chambers a round and slams into the back of the chambered round, fires, and the pressure from the round firing forces the bolt backwards and it's caught by the trigger mechanism again.
 
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