.338 ARC Barrels for AR-15

.338 ARC Barrels for AR-15

Shop .338 ARC barrels for AR-15 rifle and pistol configurations. Moriarti offers short .338 ARC barrels with a fast 1:5 twist for compact, heavy-projectile and suppressor-oriented platforms, along with a 16" 1:8 twist barrel for versatile rifle configurations. Compare barrel length, twist rate, muzzle threads, gas system, profile, and finish when selecting your 338 ARC AR-15 barrel for subsonic, supersonic, hunting, or sporting applications.

Why do short .338 ARC barrels use a faster 1:5 twist?

A faster 1:5 twist increases rotational speed compared with a slower twist at the same projectile velocity, which can be useful when a short-barrel .338 ARC configuration is intended around heavy projectiles and lower velocities. Barrel length, projectile design, ammunition, and intended application all affect appropriate twist selection, so ammunition and barrel-manufacturer recommendations should be followed.