From what I can see of Gang War:
600 Seconds recharge, 120 Seconds duration.
At the recharge cap (500% Recharge) you'd be looking at 600/5 = 120 seconds downtime.
So it'd *just about* be perma with 500% Recharge (Say, 100% Base, 100% from Enhancements, 70% from Hasten and the remaining 230% from a combination of set bonuses and LOTS of allied speedboosts...?) 
Hmm. Well it might be fun to see how close I can get anyway. Thanks for the response :O)
My MA IDs:
Fiend Space: 211464
Scratch that. Just had a look and it seems to be far more trouble than its worth. Guess I'll try something else interesting with an IO'd MM instead.
My MA IDs:
Fiend Space: 211464
Could you not try 6x Rech Procs in the KB pistol attack? How close would that get you?
Can u put the same IO many times in the same power?? I dont think so (no at least with set IOs).
Also it is a proc, It would be pure random... Despite of the good/bad to have an attack in a MM is...
PS: Ive heard this IO is bugged, actually some ppl says it is autohit. I can assure it isnt autohit in PvP, not sure in PvE.
Nope. No multi-slotting of identical procs. But a MM should have access to some powers where the LotG +Recharge IO is an option. So, while perma gang war might put a bit too much strain on your build you can get the downtime short enough to have a lot of fun with it anyway.
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
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So, while perma gang war might put a bit too much strain on your build you can get the downtime short enough to have a lot of fun with it anyway.
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I like the sound of that! 
My MA IDs:
Fiend Space: 211464
Not a huge IO expert so has anyone tried this? Is it even possible?
My MA IDs:
Fiend Space: 211464