Gun Barrel Stock: 6061 high-quality aircraft aluminum

Barrel Length: 18.5" & 20" barrels with and without the built-in porting. Porting is 2 forward blow holes on all 8 flats and liner ends 3/4th inch from muzzle end. Rifle liner runs the full length in barrels without the porting.

Standard Features: 8 flats are machined to .920 point-to-point on the Octagon barrel. Fits all .920 bull barrel gunstocks.

Diameter: .920 Bull Barrel Style

Shank Size: .001 Oversized (may require minor hand fitting)

Chamber: .22 LR Bentz Chamber - can use standard or match grade ammunition. Hyper-velocity ammo, such as CCI Stingers are not recommended.

Liner: 4140 Steel - Button rifled

.050 Thickness on LR & WMR (Magnum) liner, 6 groove

Rate of Twist: 1:16 - 22LR and WMR

1:9 - 22LR Sub-Sonic (40, 50, 60 grain ammo / accuracy range 25-50 yds.)

Caliber: . 22 Long Rifle
.22 WMR Magnum as optional caliber by barrel selection on website

Weight: Approximately 1 oz. per inch per length of the barrel

Anodizing: This is an electrochemical process that chemically infuses the color into the aluminum and will not chip, peel or scratch.