article · Aug 12, 2025 · Ballistic
Does AR Barrel Length Matter?
It seems like one of the more recent trends in ARs is building 5.56mm rifles that use longer barrels. 20-inch barrels are about the norm, and there’s the occasionally longer barrel too. This begs the question, what does a longer 5.56mm barrel net you, if anything? Advertisement — Continue Reading Below Barrel length is a classic argument that has raged for decades. Early AR-15s and M-16s originally defaulted to 20 inch barrels. As the M-16 spent years in service, that barrel length kept becoming shorter. Nowadays, most US military 5.56mm service weapons have 14.5 inch barrels (M4 Carbine). Spe
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