Why You Shouldn’t Use 55 Grain 5.56 In A Short AR15 Barrel - 11.5 Velocity Test
This is a short video showing different velocities from various 55 Grain 5.56 and .223 loads, out of a shorter 11.5 inch barrel. The point is to show how limited you are on effective range, if using this ammo in your SBR or AR Pistol.

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