I used the Rogue hunter 18 inch barrel to shoot the 10 shot challenge and got about a MOA with factory 55 grain VMAX bullets for 20 rounds. It has a BCM KMR free float hand guard, a DD bolt carrier group, a SSA-E trigger and a NF2.5-10 in an LT-104 mount using a spikes lower on this build. So yes I believe the factory gun would be at least in that ballpark. I don't think you can get the most out of it with a 1-4.
