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Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right
Polygonal rifling (/pəˈlɪɡənəl/pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.
Polygonal riflings with a larger number of edges have shallower corners, which provide a better gas seal in relatively large diameter bores. For instance, in the pre-Gen 5 Glock pistols, octagonal rifling is used in the large diameter .45 ACP bore, which has an 11.23 mm (0.442 in) diameter, since it resembles a circle more closely than the hexagonal rifling used in smaller diameter bores.[1]
^Barrel History Archived 2010-04-20 at the Wayback Machine
valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile. Polygonalriflings with a larger number of edges have...
commonly used in modern rifling have fairly sharp edges. More recently, polygonalrifling, a throwback to the earliest types of rifling, has become popular...
barrel has a female type polygonalrifling with a right-hand twist. The stabilization of the round is not by conventional rifling, using lands and grooves...
T75 is based on the Italian-made Beretta M92. The T75K3 features polygonalrifling developed at National Defense University which improve both barrel...
length optics rail, the handguard has M-LOK slots. The barrel has polygonalrifling and a new model of flash hider. Barrel life is improved from the 6...
other models having polygonalrifling instead. As of 2016 the PPQ M2 9×19mm Parabellum and .40 S&W barrels also feature polygonalrifling. The PPQ features...
with cannons using polygonalrifling instead of traditional rifled barrels, which was patented in 1854. The hexagonal polygonalrifling meant that the projectile...
locking piece. The barrels could have traditional rifling or polygonalrifling. Polygonalrifling was an outgrowth of a cold-hammer forging process developed...
are known as lands. Another system, polygonalrifling, gives the bore a polygonal cross section. Polygonalrifling is not very common, used by only a few...
In the same year Joseph Whitworth patented polygonal projectiles mechanically fitted with polygonalrifling in the muzzle-loaders. They were used in the...
produced example was the Metford rifling in the Pattern 1888 Lee–Metford service rifle. Although uncommon, polygonalrifling is still used in some weapons...
Arisaka rifles were also one of the only firearms of the era to use polygonalrifling in its barrel, rather than lands and grooves. Some of the early issue...
rounds in .50 Action Express. The Desert Eagle's barrel features polygonalrifling. The pistol is primarily used for hunting, target shooting, and silhouette...
added. New Magpul MOE SL stock added. T91K2 T91K3: The T91K3 features polygonalrifling which increases barrel life and improves accuracy. The 205th Arsenal...
discharges casings from the right in single shooting mode. The barrel has polygonalrifling and a spin length of 2.5 mm. A force of 25 N is required to pull the...
series are: The CW series uses barrels with conventional rifling, rather than the polygonalrifling employed by the P series. The CW series has a pinned-in...
traditional barrel with conventional (spiral grooves and lands) rifling, and PPS M2 has polygonalrifling. The PPS features three safeties (trigger safety, internal...
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