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hello all. new to glock pistols. and just got my new c17. i have to say that i was surprised when i looked down the barrel. my first thought was, this thing has conventional rifling! i was expecting something along the line of the hk91 type rifling. poly--- or whatever they call it. i cant see why they call it poly--- or whatever! the lands are rounded off on the top but other than that it looks conventional to me. it is it just me or do they all look like this? i know, it probably is a silly question, but can someone explain this rifling.
 

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GSD17 will be along shortly to explain Glock rifling.
Savage
 

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I am no engineer, but per GLOCK -

BARREL PROFILE
Solid, cold-hammered barrels with Tenifer surface treatment and rounded (hexagonal or octagonal) interior profiles offer numerous advantages to the user. GLOCK barrels are considerably easier to clean and maintain uniform precision even after a high number of rounds.
GLOCK barrels do not have any corners/edges (as in conventional barrel profiles - see picture) for deposits and enable better ballistic yield.
 
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