Polygonal: A two-dimensional form having more than four regular straight sides.
Doesn't really help much, does it?!?
This is an instance where a picture is worth a thousand words. Grab a bore lite and take a look at your friends Glock. You'll see the difference between it and a regular cut rifling right away.
The Glock barrels tend to build up lead fouling quicker than a regular barrel. The lead fouling if let go too long can cause pressures to rise to unsafe levels.
Many folks do shoot cast bullets in a Glock, but they keep their bores clean.
Good Luck...
Joe
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