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1/25/2018 7:38:29 AM
Posted: 8/2/2003 9:11:34 PM EST
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 5:28:39 AM EST
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 5:50:07 AM EST
[Last Edit: 8/3/2003 5:53:37 AM EST by Danno_man]
It's Glock's proof mark.
not what you're looking for, but here's some info on other markings
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