Ancient IMK2 and Mod Merc.. With level 100/100 of course
After taking a few years off whats the best gun too grind out the atrox mission. laser hand gun and carbine, im curently lvl 52 in laser hand gun
P5A + 104/105 , you cannot beat its eco, the champion for low mob
find an imp / mod korss and slap an A105 on there or A106 if you have one.
gives you great economy, and the markup is generally super low because people dont like to dump over 1k into TT of a L gun... even though in the long run its the right move.