The Gauntlet Arms AR15 10.5 Inch 5.56 NATO Barrel is built for compact AR15 pistol and SBR configurations where shorter overall length is required without sacrificing ballistic performance at close to medium range. The 4150 steel construction provides strength and heat resistance that holds up under high round counts, and the Parkerized finish creates a protective layer that resists corrosion from moisture, sweat, and environmental exposure. The carbine length gas system is positioned to work with the shorter barrel length, providing reliable cycling with standard 5.56 NATO ammunition. The 1 in 8 twist rate stabilizes bullet weights from 55 grains up to 77 grains, which covers the full range of common 5.56 loads.
The 10.5 inch barrel length is one of the most common choices for AR15 pistols because it keeps the overall package compact while retaining enough barrel length to generate adequate velocity for 5.56 NATO ammunition. At this length, standard 55 to 62 grain loads still achieve effective terminal performance out to 200 yards, though velocity is reduced compared to longer barrels. The shorter length also increases maneuverability in tight spaces and reduces the overall weight of the front end.
The carbine length gas system places the gas port approximately 7.5 inches from the chamber, which is the correct position for a 10.5 inch barrel to achieve reliable cycling. The gas port size and positioning are tuned to capture enough pressure to drive the bolt carrier rearward without overgassing, which can cause excessive wear and harsh recoil. This system works with standard carbine length gas tubes and gas blocks.
The 1 in 8 twist rate is a versatile choice for 5.56 NATO because it stabilizes both lighter 55 grain bullets and heavier 77 grain match bullets without over or under stabilizing either end of the spectrum. This twist rate is fast enough to stabilize longer projectiles at the reduced velocities that come from a shorter barrel, which maintains accuracy across different ammunition types. The twist rate also handles the ballistic coefficient differences between bullet weights without requiring dedicated ammunition selection.
4150 steel is chrome moly steel that has been heat treated to increase hardness and wear resistance. This material handles the heat and pressure generated during firing without eroding or losing dimensional accuracy over time. The Parkerized finish is a manganese phosphate coating that penetrates the steel surface and creates a matte gray or black layer that protects against rust and corrosion. This finish is more durable than paint or anodizing and holds up to cleaning solvents and rough handling.
The M4 contour is a government profile that starts with a thicker diameter at the chamber and tapers down toward the muzzle, with a step up in diameter under the front sight base area. This profile provides rigidity where it matters most while reducing weight toward the muzzle, which improves balance and reduces front end heaviness. The contour works with standard AR15 barrel nuts and gas blocks without requiring oversized or custom components.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable laws. Verify gas system length and upper receiver compatibility before installation. Inspect chamber and bore before use.
Brand: Gauntlet Arms
Model: AR-15 5.56 NATO 10.5" Inch 1-8 T Phosphate Cryo Treated Barrel
Platform: AR-15
Classification: Pistol
Caliber: 5.56x45mm
Length: 10.5
Handguard Compatibility: Freefloat
Gas Block Shelf: 0.75
Gas Length: Carbine
Profile: M4
Twist Rate: 1:8T
Finish: Nitride
Material: 4150 Chrome Moly Vanadium
Thread Pitch: 1/2x28
Barrel Extension Finish: Nitride
Name: "Sandal"
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