My 300 BLK SBR is using a 10.3" Noveske barrel, with an older EoTech 553 on top of it. That thing is hollywood scary when shooting subs out of it suppressed. And it is absolutely deadly at short to medium range (where it's intended to live). This was what first got me interested in the cartridge. It's got some great accuracy at the close ranges. Plus the ability to step up to supersonics, and step out to farther distances (relatively).