Why You Shouldnt Use 55 Grain 5.56 In A Short Ar15 Barrel - 11.5 Velocity Test

Why You Shouldn’t Use 55 Grain 5.56 In A Short AR15 Barrel - 11.5 Velocity Test

What is twist rate? Whats the best ammo for your AR15 barrel? Part1.

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11.5" vs 12.5" Barrels - Velocity Comparison

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THE AR FILES | Choosing Barrel Twist and why WE SHOOT the 1:7

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