AR15 Bolt Marking

*MALICE*

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Recently bought a High Standard bolt. Noticed it had `9 MP` engraved on it.

I know what the 'MP' stands for. What about the '9'?

I know it's not a 9mm bolt ;) so is the '9' just High Standard's brand designator (Like MPC for Colt or MPF for FN?), or does it stand for something else?


And because I know it's going to be mentioned in at least a dozen responses, I do know what the MP stands for, I'm just curious about the number :)
 
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