Hmm, have a 50 MA/SR but haven't tried it since Mission Architect came out. SR took a hit to elusivity, so I think build will have to change a bit to adjust for this. I myself was running only basic IO sets with a couple LoTGs. With the intro of the new PvP IOs though I think any previous Mids is going to be only a baseline.
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anything that will help me in pvp bit, thanx for the help hope to see you mids build soon. 
Nacht Nova Thunder = Level 50 (Liberty) Dark Blaster/Storm Summoning - Defender
Nova Ninja = Level 50 (Liberty) spines/ Regeneration - Scrapper
CanadianMan = Level 50 (Liberty) Super Strength/Invulnerability - Tanker
LibertyBoy = Level 35 (Liberty) Stone Armor
/Fiery Melee - Tanker
My main PvP Hero is a MA/SR Scrapper. Under I12 the combo was "meh", under I13 it finally felt right and under I14 performance is sub-I12 levels. You truly must be able to cope with regular defeats to bother bringing one of these to PvP. My Rep-to-loss ratio is 4.28:1.
If you bring your MA/SR to PvP, bring a healthy sense of humor and a very positive attitude towards losing. You'll need all the mental toughness you can get to play this combo to any degree of success.
Nonpositional Psi attacks and Super Strength are your two main weaknesses. Against the untyped Psi your only hope is to find the caster and get them taunted/killed ASAP. Against the Super Strengther, you'll need to use Elude to stand any chance (they'll hit you 75%-85% of the time otherwise).
The good news is you'll do pretty well against Stalkers and non-SS Brutes. Others are hit-and-miss depending on many factors.
Building is very straight forward. Take all the single target attacks from MA except Thunder Kick and Cobra Strike. Take Taunt. You might want to take Jump Kick as a filler. You'd be surprised how many kills I've finished off with Jump Kick.
Take the all of SR.
Take the Weapons ancillary pool. Targeting Drone, Caltrops, Webnade and the regular Shuriken (good place for a Purple damage proc). Put a Perception IO in TD and your Perception should be self-capped. You'll find many a Stalker between your Perception and Caltrops. Any time you stop jumping, cast the Caltrops on the ground.
You might consider IOing out for +Damage instead of Defense. Defense is kinda jokey right now, but it does help some. It's up to you.
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Just wondering if anyone else out there has this build and whether or not they could share mids build to help me out I'm kinda getting lost lookin for good pvp build please post you mids build. Thanx for your Time
Nacht Nova Thunder = Level 50 (Liberty) Dark Blaster/Storm Summoning - Defender
Nova Ninja = Level 50 (Liberty) spines/ Regeneration - Scrapper
CanadianMan = Level 50 (Liberty) Super Strength/Invulnerability - Tanker
LibertyBoy = Level 35 (Liberty) Stone Armor
/Fiery Melee - Tanker