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Posted: 9/15/2004 8:00:04 PM EDT
Is the only purpose of a step-cut BBL for attachement of a grenade launcher?
Link Posted: 9/16/2004 9:21:23 AM EDT
Link Posted: 9/17/2004 10:46:36 AM EDT
Yes, and the looks.
Link Posted: 9/17/2004 12:09:24 PM EDT

Well it looks odd to me, but not ugly or annoying. I'm assuming the BBLs are corrected for accuracy because as I understand the physics of a BBL they have to be desinged, mounted, and have things attached in a just the right way because the harmonics can affect accuracy, right?
Link Posted: 9/17/2004 9:59:59 PM EDT
No science here. Stepped barrels are slightly cheaper to produce. The name of the game is to reduce the barrel diameter from the chamber to the muzzle to save weight. Taper or step, makes zero difference.

Some barrels (like the M-14) have a combination of stepped and tapered. Most sporting rifles are tapered. The AK has a stepped barrel; the shoulders of the steps are used to provide solid back-stops for the gas block and front sight.

I am having several AR barrels custom milled down from HBars. They will have straight/tapered barrels. Why? For extra diameter (rigidity) and mass (heat).
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