After experimenting with the different campaign scenarios, I decided to just kill the remaining enemies I need to reach 1,500 kills in front of the Cathedral in Leon's campaign (Chapter 2). I was thinking of using the following skills:
However, I remembered that the Assault Rifle RN isn't very steady at all when fired and appears to fire in an ascending direction. LOL. Would you guys suggest I substitute the [Lock-On] or the [Rock Steady] skill in stead? Is [Lock On] more appropriate for sniper rifles? Any input would be greatly appreciated. No trolling though, please. Thanks a bunch!
You should be fine with that set up, instead of holding the trigger when enemies are at a distance, try burst firing. You're going to be doing considerable damage as it is, so no need to completely unload.