Rifling refers to the helix-shaped pattern in the barrel of a firearm, which imparts a spin ... it a cross-section resembling a gear, though it can also take the shape of a polygon ...

Polygon Rifling Medium-Heavy Contour 27? Barrel Threaded with Muzzle Brake Bottom Metal-Detachable Box Magazine System 1 ? 5 Round Magazine

Polygon Rifling Medium-Heavy Contour 26? Barrel Threaded With Cap Bottom Metal-Detachable Box Magazine System 1 ? 5 Round Magazine Trigger-

The Gas Trap - Instead of the Stoner Gas System. The Barrel ? Heavy contour with Progressive Gain Twist Polygon Rifling. The Gas Tube ? Same mil spec but of a different length ...

It started with a proprietary process called Polygon Progressive Rifling, 6061 T-6 aircraft grade aluminum construction, and a specially designed barrel vent system.

That also somewhat would explain the experience of polygon taking less propellant, and points out a possibility that polygonal rifling might work that much better with a moly ...

Conventional and 5-land Polygon (P5) rifling options. Good prices ($254/blank). David Tubb uses Gary Schneider's barrels exclusively. Enough said.

The polygon rifling and a better trigger... My USP was one of the firsts. It has a heavy trigger that takes a firm hand to shoot well. The rifling is the standard Lands and ...

From the originators of Polygon Progresive Rifling comes the all new Rf/x Scenario Series Internally Rifled barrel! You've never seen anything like it..

... Walther Barrel Blank .22 16mm dia X 605mm long, Polygon Rifling with choke. Price: £97.20