Best SBR Ammo for Your AR-15: Why Regular 5.56 (XM193) Might Not Be the Best Choice
1The SBR Struggle: Why Barrel Length Matters2Example Ballistics for Short Barrel vs. Standard Barrel Length Using Regular 55 grain FMJ 556 Ammo3Similar Issues With M855 62 Grain Green Tip 556 Ammo ...
