ZR has like 1 or 2 to hit SO's in his incince
err
3 end reduct on FA 3 to hit
so i have only 1 or 2 accs in my attacks 
works ok but if ur gonna pvp u may want more
If you have 2 ACC SOs then you should be able to hit pretty much anything, FA is equivilent to near enough 1 acc SO (when slotted fully) so you would lose in essence 1 acc SO and need to run a pretty meaty toggle. Personally for PVE I wouldnt bother with it, since ED you have the slots spare for acc which would ahve been used for more damage pre-ED.
I took FA purely for pvp reasons on my scrappers (+perception) If PVP isnt your goal then I wouldnt bother and I hear weapon mastery is a good one to take.
**Acceptable "support" responses**
Its your fault
Its your computers fault
Its your ISPs fault
I think it's been pretty much been said but I can't stress enough not to take out all acc SO's.
Personally I run FA with 3 endred SO's and 3 tohit buff SO's with one accuracy in each attack and still miss about one in 7-8 shots. All in all it is a good power well worth taking and spending the slots on IMO.
I personally feel you should just go ahead and take any epic pool that you feel would add anything to your character and playstyle. If i was a spines i may see other pools more useful than weapon mastery but as a broadsword i may not and often the bonuses from the secondary also come into it.
The 3rd endurance slot in focused accuracy offers an endurance reduction that is smaller than the others and it maybe a good idea to look at your build and check to see that there isnt anywhere else you can have a slot (not necessarily endurance either) that may make the build better overall. Keep 1 accuracy atleast in all attacks if you plan to exemp pve. If you exemp PvP below the level at which you have taken focused accuracy then you can if you are willing just swap your enhancement slotting (ie take out that extra recharge you wanted for 50 game and put back that accuracy).
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
I have FA on my Spines/Regen, I slot it 3 end reds, 3 to hit buffs. It really is an expensive toggle, more expensive than Hero Builder states ( I've heard twice as expensive ) so 3 ends reds is not excessive.
IIRC It has a base between 18 and 20, I think it is 18.75. With 3 to hits it has about a +30 to hit buff.
To hits against 0,+1,+2,+3,+4,+5
none 75 68 61 55 48 41
1 SO 95 90 81 73 63 54
FA0 94 87 80 74 67 60
FA3 95 95 91 85 78 71
2 SO 95 95 95 91 80 68
FA0 1SO 95 95 95 95 89 79
FA3 1SO 95 95 95 95 95 94
I play on Unyielding, as such I have removed all accs from some of my attacks ( the 2nd tier attack lunge, Spine Burst the PbAoE, Quills the damage Aura ) but left one ACC in Impale, Ripper and Throw Spines. I am considering dropping the ACC in Throw spines.
Damn I just realised you are MA. That is extra accurate with a 5% acc ( not to hit ) bonus the same as broadsword and katana.
none 78 71 64 58 50 43
1 SO 95 94 84 76 66 57
FA0 95 91 84 77 70 63
FA3 95 95 95 89 82 75
2 SO 95 95 95 94 82 70
FA0 1SO 95 95 95 95 92 83
FA3 1SO 95 95 95 95 95 95 89 76*
* I carried this on for 2 levels just for a laugh.
As you can see, dropping all ACC will cap your to hit against oranges (+2s) but not against reds ( +3s) . Personally I would leave one ACC in some key attacks just for those big teams where you are fighting +3s to +5s.
@Unthing ... Mostly on Union.
just wanted to add my two cents...
i run FA with 3 end recs and 3 tohits on my kat/regen, ive taken out all accs in my attacks (i normally only ever slot 1 acc in attacks anyway) this allowed me to not take hasten and slot a few recharges instead.
works for me in pve very rarely miss, as its mainly a solo toon i tend to notice hehe. being a solo toon means of course im never fighting over +3 mins etc.
so in answer to your question i would say that is totally possible (EBs AVs im hitting as much as i would with 1 SO or seems to be not tested any of this )
being a fellow regen (hello 
)the end cost of FA is not bad at all (rarely dipping below half during the longest of AV/EB/GM fights) so i would say if you want to its totally possible, and from what ive found it works! i might have to shop if i ever exemp however.....
that said cant possibly commment on a pvp situation as i cant bring myself to enter.....
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I have FA on my Spines/Regen, I slot it 3 end reds, 3 to hit buffs. It really is an expensive toggle, more expensive than Hero Builder states ( I've heard twice as expensive ) so 3 ends reds is not excessive.
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Every now and again someone comes out with something that says that herobuilder is wrong and not being one to test something i have never considered worth worrying about, i wouldnt normally bother but today i am having huge lag on live so i went to go on test to play with respec builds and can only say from what i am looking at yes your right it is almost double by the looks of things i think its about 1 eps. I find though relying on 1acc versus upto orange okay generally but above that and i want more. My hold for sappers that are orange or red to me normally has 2 acc and 3 slotted tohit in focused accuracy to rely on and if i am still worried then its rage, i miss enough as it is, to go less would be not good.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
Hero Builder is partially correct, it says that the end cost is 0.59 but this is per tick, not per second. Focussed Accuracy ticks twice every second, meaning it has a cost of 1.18 end/sec.
When i go into the recovery part of herobuilder it says:
Focused Accuracy (EPS=0.585)
That's so misleading aint it. Actually maybe i am being misleading i dont know but even my normal toggles were looking worse than expected.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
To be fair, there's such a huge amount of data which needs to be gathered for Hero Builder they probably just saw the end/tick number and assumed it was end/sec.
Get focussed acc if you want more dps in PvE. Oh yeah, its a must take in PvP unless you have a weird idea. I use darkness mastery cause it gives me tools (1 hold, 1 ranged attack). I have to respec for i7, I just cant decide. I prolly stay Darkness mastery on my main, and body on my PvP tool.
In PvE you can almost go without acc, and if you are invu, I would defo. do it. the boost from invinc should be high enough to make it fully viable.
In PvP the more acc the better. Bare in mind the foc acc (3 tohit) + BU (3 tohit) + tactics (3tohit) doesnt always hit through elude.
A Paragon Defender
I have Focussed Accuracy slotted as 3 end reduction and 3 to hit buffs (all 50+ or better). With 52+ or 53 SOs in all my attacks, i don't miss the computer targets very often. I don't do pvp very often either, but i don't miss much in there either. I even find it relatively easy to hit stalkers when they're hidden.
As for against the computer....ever been annoyed by Advanced Drones? having fought orange and red ones....with FA i hardly seem to miss. it does still happen, but isn't there a base chance to miss of 1 in 8 attacks no matter what the acc/toHit buff is? i'm not sure. Anyways! FA rocks. drinks end, but its great. and the +Perception is funny for fighting Stalkers. 
@Willow R
Main Hero:
Willow R (Emp/Rad Defender, lvl 50)
Matakoshi (kat/regen Scrapper, lvl 50)
There's always a 5% chance of missing against minions (1 in 20). And yeah, Rikti drones have much more defence than normal mobs.
Must admit don't have much problem with the drones but can't stand Nems with stacked vengence once they have three or more applications stacked FA isn't going to help much anyway and I do still have one accuracy slotted in each attack (LV53's) with FA slotted 3 endreds and and 3 tohit.
Hi there, i'm just coming up to the epics with my 1st scrapper and was wondering if i was to slot FA with 3 End Redux, 3 ToHit Buffs, would i be able to take the Acc out of my current attacks. I currently have 2 Acc in each attack and if i could would like to drop them both in favour of Recharges/End Redux.
What are peoples views on this method?
And fyi i normally play on Invincible, dropping down for EB/AVs