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Posted: 8/2/2003 10:11:34 PM EDT
On my barrel on my G23 where the ejection port there is a pentagon stamped on the right next to the Glock symbol.

Anyone know what this means?
Link Posted: 8/3/2003 6:28:39 AM EDT
I believe it refers to the rifling in the barrel...i.e., use jacketed bullets, NOT unjacketed lead, which will screw-up the rifling and "could" cause a Ka-Boom. Check the manual with regard to ammunition....the usual recommendation is... jacketed bullets and NO reloads....if you want to keep the warranty in force.

RugerCal480 (Mike)
Link Posted: 8/3/2003 6:50:07 AM EDT
[Last Edit: 8/3/2003 6:53:37 AM EDT by Danno_man]
It's Glock's proof mark.
not what you're looking for, but here's some info on other markings
www.glockfaq.com/markings.htm
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