Is 12.5″ the Ideal Barrel Length for your AR Build?

BCM Standard 12.5" Upper Receiver Group with Daniel Defense Lite III(DDM4) 9" Handguard
BCM Standard 12.5″ Upper Receiver Group with Daniel Defense Lite III(DDM4) 9″ Handguard has a new feature up on their website praising the 12.5″ barrel length for the AR-15.  The article and corresponding video make a case for the 12.5″ rifle with a carbine length gas system in 5.56 based on a few key factors.

When I explored building my first SBR in 5.56, I ended up almost building 11.5″ rifle due to similar concerns about maneuverability, reliability, and velocity, all of which are explored here.  According to this well-reasoned piece, the 12.5″ length hits the perfect sweet spot and is a great all-around barrel length.

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