BCA vs Group Barrel - My Adventures with 6.5 Grendel

[Hollis]

Here's the specs on the BCA upper: BCA AR-15 Complete Upper Assembly, 20" 4150 Black Nitride Straight Fluted Barrel, 6.5 Grendel, Rifle length gas system, 1:8 Twist w/ 15" M-LOK (later traded out for a non-fluted stainless steel 20" barrel)

The Group Barrel is 20" also.