probaly the plasma rifle, its my favirote gun, shoots fast, has good critical rate double of other guns good capacity also.
I agree, the weapon you get from Harkness (A3-21 Plasma Rifle) does some major damage, it seems more powerful and reliable than guns that have higher damage output. The only fault I see with it is it's not good long range in which case I use Lincolns Repeater or "The Victory",Sniper,"Rifle". Mike
the MPLX Novasurge is incredible so strong
IMO the Lincoln Repeater Rifle if your small guns skill is high enough...fires .44's and can be repaired with any hunting rifle. its in the museum of history