heh... i have r2 sf from r0+r5
incidentally... r4 does not necessarily mean better than r3
because a r4 shooting at r3 does the same damage as a r3 shooting at r3. and r4 shooting at r4 will do less dmg than a r3 shooting at r3... usually.
in either case... shooting range is bugged and is atm (and for the last year and a bit) pretty much infinite anyway.
So what if distance penalties are the same regardless of maximum range (doesn't feel right though), r4 (or r5) still get an extra round of shots without moving forward to expose themselves.