I would have a CheyTec Intervention. The differences it has to a normal one is that through the use of a modified scopes and rounds, I will hit anything I'm aiming at even if during flight something stops in front of my target. Secondly, my scope will have an inbuilt HUD that automatically marks hostile targets with zero error and an auto zoom in case the target is unseen except for a small red bracket. On top of that, effective range would be up to five kilometers and I'd also have something that makes these rounds from... hopefully nothing so I'm not forced to use inferior ballistics.
I would name it... "The Harbinger"... or some s@&^ like that.