The problem is why would they build such a gun with that short of a barrel, in that weight of barrel and over all weight? I would think like the 50 cal BMG they would wan't some serious weight of the gun to handle recoil much better and flinch would be a serious concern with that gun in that barrel and stock configuration, 1 shot and "most" would be a flincher for along time!
I would have made it a heavy barrel with 28"-32" of length and went with a bigger stock and one that offered much more weight, also for accuracy sound would be much louder, but a muzzle break would be mandatory for great accuracy.