[Sevens]

While I haven't looked down the bore of an OEM Glock barrel, I've seen the polygonal rifled barrel that HK uses in their USP pistols and when comparing it to a normally rifled barreled, it almost looks to me like a regularly rifle barrel that's been worn out. Nothing about that barrel makes it look more difficult for a lead bullet to pass through it, but it looks in fact MUCH easier for any bullet to pass through.

Obviously, there's no science to looking down a barrel and making an observation, but in the end, I just don't see why the polygonal rifling is more trouble for a lead bullet.