Gvs dont need range icons. When you see their icon, you inside gun range (theirs usually). hehe
An alternative RANGEFINDER icon would be to have a "progress" bar.
P-38
=---
Would be inside 1k range
P-38
==--
would have the P-38 be at 2k range
P-38
===-
Would be 3k away
P-38
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Would be 4k away
As you close in distance the bars tick left or right. Icon range is 6, so you can have up to 6 bars.
This way you can have the pilot have a DECENT (not EXACT) idea of how far away a target is, he will KNOW when a target will be inside the game's max range guns (.50's), but wont have the exact rangefinding.
I believe this icon will result in people really FLYING to get a gun solution rather than "cool, hes at d900, I know that if I spray a few hundred rounds of .50 half an inch in front of him ill ping him some" or "cool, hes at d400 , I know if I lead by 1/4th an inch ill ping him some" situation and instead go "ok im in gun range, i can spray a bit and i dont know if i'll hit..and this guy hasnt seen me yet, so if i shoot now he'll see mee.. but if i get closer ill nail him good..." kind of mentality (which IMO is closer to "reality").
And gawd knows I abuse the rangefinder myself. Ask urchin, I think he still remembers when I blasted his Ta152 from d950 just by spraying half my ammo on him. And then again, theres no sweeter kills than really saddling up on a con and ripping his arse to piecees at d200.