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I bought a Glock-17 the other day and I was wondering what the AT stands for and the pentagon with a dot in the middle this is all on the barrel. Wondering if someone knows what it means???
 

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btyervfd said:
I bought a Glock-17 the other day and I was wondering what the AT stands for and the pentagon with a dot in the middle this is all on the barrel. Wondering if someone knows what it means???
Austria not sure about the other symbol
 

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Unconfirmed, but I've been told it's just part of the proof marking and signifies a polygonal rifling either hexagonal or octagonal.

I've not been able to get anyone who knew why some have a dot inside and some don't..............
 

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From what I've heard the pentagon symbol signifies the grade of steel that the barrel is made out of. In my experience, the old black-coated barrels that had a regular pentagon were a softer steel than the new gray-coated barrels which have the "dotted" pentagon.
 
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