Do you really want an SBR? AR 15 Velocity and Energy comparison Chapter One .223

Yubunahedi
  • 8 years ago
CHAPTER TWO WITH 5.56 NATO IS UPLOADED!! How does barrel length affect projectile velocity and energy? More info Below: .
Do you really want an SBR? AR-15 Velocity and Energy Comparison - 5.56 & .223 How does barrel length affect projectile velocity and energy?

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