...but I don't think an M2 would (satisfactory) handle being in austere environments and/or for use in military deployments as a M4/M1014 would. This M4 Drone Guardian (AGRO) is more suitable handle the rough(er) conditions of military/tactical applications than a M2 (Inertia Drive).
No knock against the great M2 (or original M1/ convertible M3), but I personally wouldn't deploy with one if given the choice. The new "Advanced Impact" patented barrel with a larger and longer cone sounds interesting to say the least.