Details
Bear Creek Arsenal 10.5 Inch .338 ARC Pistol Length H-Bar Barrel, 1:8 Twist, Parkerized 4150 CrMoV, 5/8x24 Threading
The Bear Creek Arsenal 10.5 inch .338 ARC barrel brings the newer .338 ARC cartridge to compact AR-15 platforms. Machined from 4150 Chrome Moly Vanadium steel with a parkerized finish, this barrel handles the pressure and heat of the .338 ARC round in a pistol length gas system configuration. The 1:8 twist rate stabilizes projectiles across the .338 ARC weight range, and the H-Bar profile adds rigidity for consistent accuracy. The 0.750 gas journal accommodates standard low profile gas blocks, and the 5/8x24 threading accepts most .30 caliber muzzle devices and suppressors.
Key Features
- 10.5 inch barrel chambered in .338 ARC for AR-15 platforms
- 4150 Chrome Moly Vanadium steel construction handles pressure and heat
- Parkerized finish provides corrosion resistance and durability
- 1:8 twist rate stabilizes .338 ARC projectiles reliably
- H-Bar profile adds weight for improved heat dissipation and accuracy consistency
- 0.750 gas journal fits standard low profile gas blocks
- Pistol length gas system for compact builds
- 5/8x24 threading accepts .30 caliber muzzle devices and suppressors
Perfect For
- AR-15 builders exploring the .338 ARC cartridge for hunting or defensive use
- Shooters seeking a compact platform with more energy than 5.56 or .300 Blackout
- Anyone building a pistol or SBR configuration in .338 ARC
.338 ARC Cartridge Performance
The .338 ARC is a newer cartridge designed to bridge the gap between 5.56 NATO and larger hunting rounds. It delivers more energy and a heavier projectile than .300 Blackout while still functioning in AR-15 platform dimensions. This makes it viable for medium game hunting or situations where you want more terminal performance than 5.56 provides, all in a compact package.
1:8 Twist Rate
The 1:8 twist stabilizes .338 ARC projectiles across the typical weight range for this cartridge. This twist rate is optimized to handle both lighter and heavier bullet options reliably, giving you flexibility in ammunition selection based on your intended use.
H-Bar Profile
The H-Bar profile is heavier than a standard government profile barrel, adding material under the handguard area. This extra weight improves rigidity and helps dissipate heat during sustained firing. The added mass reduces barrel whip and supports accuracy consistency, particularly beneficial in shorter barrels where harmonics can be more pronounced.
4150 CrMoV Steel
4150 Chrome Moly Vanadium is a durable barrel steel known for strength and heat resistance. This material maintains dimensional stability under the pressure and heat of repeated firing, and the chrome moly content resists throat erosion better than softer steels. The barrel holds headspace and chamber dimensions over thousands of rounds.
Parkerized Finish
Parkerizing is a phosphate treatment that penetrates the steel surface, providing corrosion protection and a non reflective matte finish. This coating resists rust from environmental exposure and holds up under hard use. Parkerizing also provides a rough surface that holds lubrication better than bare steel.
Pistol Length Gas System
The pistol length gas system is designed for barrels in the 10 to 11 inch range. This shorter gas system length allows reliable cycling in compact configurations where the gas port sits closer to the chamber. The 0.750 gas journal diameter is the standard for low profile gas blocks on AR-15 barrels.
5/8x24 Threading
The 5/8x24 thread pitch is the standard for .30 caliber rifles, accommodating most .30 caliber muzzle devices, brakes, flash hiders, and suppressors. This threading ensures you have compatibility with a wide range of aftermarket options for managing recoil, flash, or sound signature.
Verify compatibility with .338 ARC bolt and magazine system before purchase. Gas block is a separate component mounted beneath the handguard. Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws.
