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A 5.45 x 39mm AR-15 is fired with carbine, 9mm, and H buffers. Although all three buffers allow the weapon to work, function is most ideal with the H buffer. Video Typo – The BCM H buffer is 3.8, not 3.9, ounces.

Source: The Firearm Blog

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A 5.45 x 39mm AR-15 is fired with carbine, 9mm, and H buffers. Although all…