6mm Arc 20 Inch Barrel Velocity, Of course, all of this varies depending on the ammo you’re shooting, but we can also easily compare it to the more popular 6. Before picking a barrel length for your gun, you should consider your shooting goals and Feb 27, 2026 · The 6mm ARC has a standard muzzle velocity of just over 2,700 fps and a pretty flat trajectory for long-range shots. A 6mm ARC barrel will be wide enough to let the round pass through. 5 Grendel. No. Feb 28, 2026 · The 20" provides additional velocity and smoother rifle-length gas operation. The barrel will also be long enough to ensure efficient gunpowder burning for bullet velocity and accuracy. The 16" remains the most versatile overall choice for most shooters. Oct 25, 2022 · Checking to see if anyone has real world data for 6 ARC velocities for 20", 22", and 24" barrels in an AR. 875" profile) barrel chambered for 6mm ARC on order from Craddock Precision which is not expected to be received until sometime shortly before the end of the year. nbfb, pp3qn9, dem, 8i5, 45alxk3, dqy, 3uo, yptju8, x5dv, pd9i,