The Sanders Armory 18″ Match Grade 6MM ARC 416R Stainless Steel Barrel with Tapered HBAR profile with 1:7.8 Twist Rate is a MEDIUM weight HBAR barrel with Rifle-Length Gas and 5R Rifling. The tapered HBAR precision barrel has been hand lapped and air gauge tested with 5R rifling for long-distance shooting with below Sub MOA guarantee. We use M4 Barrel extensions with a manufacturer’s Limited Lifetime warranty against manufacturers’ defects. It uses a .750 Gas Block with a Rifle Length Gas tube.
Expect nothing less than professional grade 6MM ARC barrels from Sanders Armory.
U.S.-made and manufactured to MIL-SPEC specifications exceeding the ISO-9002 Quality Standard. Provided with a Limited Lifetime Manufacturer Warranty against manufacturers defects.
- Brand: Sanders Armory
- Barrel Caliber: Match Grade 6MM ARC
- Barrel Length: 18″ Inch
- Twist Rate: 1:7.8 Twist
- Rifling Process: 5R Button Rifled
- Barrel Prep: Hand Lapped
- Barrel Concentricity held to .002
- Rifling Test: Air Gauged
- Material: 416R Stainless Steel
- Finish: Polished Stainless Steel
- Barrel Interior Finish: Polished Stainless Steel
- Profile: Tapered HBAR (medium weight HBAR)
- Gas System Length: Rifle-length Gas Tube
- Seat Diameter Gas Block: .750 Gas Block
- Gas Block Dimple: Yes
- Crown Thread Pattern: 5/8 X 24 Thread Pitch
- Barrel Crown: Single Point Cut Polished 11-degree Target Crown
- Barrel Extension: M4 Nitride Coated
- Feed Ramps: M4 cut Barrel extension
- Weight: 2 Lbs 5oz.
What is 5R Rifling?
Retired Army man Barrett “Boots” Obermeyer developed 5R rifling as a gunsmith in his families store and holds a High Master Classification in both high-power rifle disciplines; he is a Distinguished Rifleman and has won numerous shooting awards at both state and national levels. The best definition comes from “Boots” himself …
“5R is the form of rifling I developed for use in most target barrels and many sporting barrels,” he explained. “These barrels have five grooves, and the lands have angular sides. I have observed that bullet jackets will deform such that they remain closer to the R-form lands than they will to the sharp-edged lands present in conventional-style rifling. This reduces powder fouling at the corner of the grooves. The land’s angled form also helps reduce jacket failures in quick-twist barrels.”
The diagram above of rifling profiles shows the difference between traditional rifling (top) and 5R rifling (bottom). Note that the edges of 5R are not square (they don’t cut into bullet jackets as much) and that with 5R, the lands are opposite of the grooves, while with traditional rifling, lands are opposite lands, and grooves are opposite grooves.
NO shipping to District of Columbia (Washington, D.C.); Massachusetts; Connecticut; Chicago; Cook County, Deerfield, Highland Park or Aurora Illinois; New Jersey; New York; Puerto Rico; Hawaii; or Canada. NO international shipping; all must be within the 48 Contiguous United States. NO APO/PPO/FPOs.