I'll try and remember to take a closer look tonight but overall I would say you're focusing on the wrong things. You've got quite a few 4-slotted sets which is, generally, a poor choice for getting set bonuses. Ideally with an AR/Dev you want to try and build up recharge (for more Full Auto) and Ranged Defense (to keep you safe while hiding behind caltrops).
If you aren't going for set bonuses and simply want to slot IOs to boost individual powers (which is often referred to as Frankenslotting) you can do it cheaper and more effectively by using a mix of cheaper sets.
Finally (and this is a personal opinion, YMMV) Munitions Mastery is a poor choice for AR/Dev. I used it on my AR/Dev for a long time but eventually gave up and switched to Mu Mastery and the difference is amazing. Body Armor provides so little resistance that it's barely worth having. The rest of the set is ok but IMO the only power that is really useful and not available elsewhere is Surveillance. LRM is very cool but AR is so AoE heavy you don't really need it. Cryo Freeze Ray is useful, but other sets offer functionally identical powers (although the lack of redraw is nice). Sleep Grenade doesn't really synergize well with AR (due to all the AoEs), although it does work well with Devices if you want to do the sleep + time bomb combo. Personally I switched to Mu Mastery since the shield is significantly better and I could take an AoE immobilize which is always handy. Admittedly the loss of Surveillance does hurt since it helps counter AR's low ST damage (outside of Ingite) but I just turn of bosses and set the difficulty to more players since that's what I enjoy anyway.
Ok, I've posted two build below. The first is your build (power selections and order) with the slots moved around a bit and sets changed to try and improve it. I've built in about 27% ranged defense and 66% recharge which is pretty decent. You might want to tweak some things a bit, for example both Aid Self and Aid Other are rather slight on enhancement, depending on your style and whether you prefer solo or team play you might want to add some more slots there (Targeting Drone is probably a good place to take them from). I also moved the stealth IO to Sprint so you'll have to turn that on when you need stealth.
The second build is the one I use on my AR/Dev in case you're curious. It's a more defensive build with about 41% ranged defense and more control but it lacks aid self and has some endurance issues without the Alpha slot (I'm ok solo but on a team I have to be careful or turn off a couple of toggles).
As always my advice is to look at multiple builds and then use that to build something you're happy with. Everyone has their own budget, style and preferences so an off-the-shelf build is rarely a perfect fit. Both builds are pretty pricey, if you need something cheaper I can offer advice there as well.
Your build re-slotted:
Hero Plan by Mids' Hero Designer 1.90
http://www.cohplanner.com/
Click this DataLink to open the build!
Molly.EXE: Level 50 Technology Blaster
Primary Power Set: Assault Rifle
Secondary Power Set: Devices
Power Pool: Flight
Power Pool: Medicine
Ancillary Pool: Munitions Mastery
Hero Profile:
Level 1: Burst -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(3), Thundr-Dmg/Rchg(7), Thundr-Acc/Dmg/Rchg(7), Thundr-Acc/Dmg/EndRdx(11), Thundr-Dmg/EndRdx/Rchg(17)
Level 1: Web Grenade -- TotHntr-Acc/Rchg(A), TotHntr-EndRdx/Immob(5), TotHntr-Acc/EndRdx(25), TotHntr-Immob/Acc(43), TotHntr-Acc/Immob/Rchg(45), TotHntr-Dam%(46)
Level 2: Slug -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(3), Thundr-Dmg/Rchg(19), Thundr-Acc/Dmg/Rchg(33), Thundr-Acc/Dmg/EndRdx(37), Thundr-Dmg/EndRdx/Rchg(37)
Level 4: Caltrops -- P'ngTtl-EndRdx/Rchg/Slow(A), Slow-I(5)
Level 6: Hover -- LkGmblr-Rchg+(A)
Level 8: M30 Grenade -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(9), Posi-Dmg/Rchg(21), Posi-Acc/Dmg/EndRdx(37), Posi-Dam%(45)
Level 10: Targeting Drone -- GSFC-ToHit(A), GSFC-ToHit/EndRdx(11), GSFC-ToHit/Rchg(21), GSFC-Rchg/EndRdx(27), GSFC-ToHit/Rchg/EndRdx(31), GSFC-Build%(46)
Level 12: Sniper Rifle -- ExecCtrt-Acc/Dmg(A), ExecCtrt-Dmg/EndRdx(13), ExecCtrt-Dmg/ActRdx(15), ExecCtrt-Dmg/Rng(23), ExecCtrt-Dmg/Rchg(34), ExecCtrt-Stun%(36)
Level 14: Fly -- Zephyr-Travel(A), Zephyr-ResKB(15)
Level 16: Smoke Grenade -- HO:Lyso(A), HO:Lyso(17)
Level 18: Flamethrower -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(19), Posi-Dmg/Rchg(31), Posi-Acc/Dmg/EndRdx(34), Posi-Dam%(39)
Level 20: Cloaking Device -- LkGmblr-Rchg+(A)
Level 22: Aid Other -- Dct'dW-Heal/EndRdx/Rchg(A), Numna-Heal/EndRdx/Rchg(23)
Level 24: Aid Self -- Dct'dW-Heal/EndRdx/Rchg(A), Numna-Heal/EndRdx/Rchg(25)
Level 26: Ignite -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(27), Posi-Dmg/Rchg(33), Posi-Acc/Dmg/EndRdx(43), Posi-Dam%(46)
Level 28: Trip Mine -- Armgdn-Dmg(A), Armgdn-Dmg/Rchg(29), Armgdn-Acc/Dmg/Rchg(29), Armgdn-Dam%(31), Armgdn-Acc/Rchg(42)
Level 30: Resuscitate -- RechRdx-I(A)
Level 32: Full Auto -- Ragnrk-Dmg(A), Ragnrk-Dmg/Rchg(33), Ragnrk-Acc/Dmg/Rchg(34), Ragnrk-Acc/Rchg(40), Ragnrk-Knock%(40)
Level 35: Buckshot -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(36), Posi-Dmg/Rchg(36), Posi-Acc/Dmg/EndRdx(50), Posi-Dam%(50)
Level 38: Gun Drone -- ExRmnt-Acc/Dmg(A), ExRmnt-Acc/Rchg(39), ExRmnt-Acc/Dmg/Rchg(39), ExRmnt-+Res(Pets)(40), ExRmnt-Dmg/EndRdx(42), ExRmnt-EndRdx/Dmg/Rchg(43)
Level 41: Body Armor -- S'fstPrt-ResDam/Def+(A), ResDam-I(42)
Level 44: Surveillance -- AnWeak-Acc/DefDeb(A), AnWeak-DefDeb/EndRdx/Rchg(45)
Level 47: LRM Rocket -- AirB'st-Dmg/Rchg(A), Posi-Dmg/Rchg(48), Det'tn-Dmg/Rchg(48), HO:Nucle(48)
Level 49: Sleep Grenade -- FtnHyp-Sleep/Rchg(A), FtnHyp-Acc/Rchg(50)
------------
Level 1: Brawl -- Dmg-I(A)
Level 1: Sprint -- ULeap-Stlth(A)
Level 2: Rest -- RechRdx-I(A)
Level 1: Defiance
Level 4: Ninja Run
Level 2: Swift -- Flight-I(A)
Level 2: Hurdle -- Jump-I(A)
Level 2: Health -- Numna-Regen/Rcvry+(A), Mrcl-Rcvry+(13)
Level 2: Stamina -- EndMod-I(A), EndMod-I(9)
My AR/Dev:
Hero Plan by Mids' Hero Designer 1.90
http://www.cohplanner.com/
Click this DataLink to open the build!
Adeon Hawkwood: Level 50 Technology Blaster
Primary Power Set: Assault Rifle
Secondary Power Set: Devices
Power Pool: Leaping
Power Pool: Leadership
Power Pool: Fighting
Ancillary Pool: Mu Mastery
Hero Profile:
Level 1: Burst -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(3), Thundr-Dmg/Rchg(3), Thundr-Acc/Dmg/Rchg(5), Thundr-Acc/Dmg/EndRdx(17), Thundr-Dmg/EndRdx/Rchg(23)
Level 1: Web Grenade -- TotHntr-Acc/Rchg(A), TotHntr-EndRdx/Immob(31), TotHntr-Acc/EndRdx(34), TotHntr-Immob/Acc(45), TotHntr-Acc/Immob/Rchg(45), TotHntr-Dam%(46)
Level 2: Slug -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(5), Thundr-Dmg/Rchg(7), Thundr-Acc/Dmg/Rchg(7), Thundr-Acc/Dmg/EndRdx(11), Thundr-Dmg/EndRdx/Rchg(11)
Level 4: Buckshot -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(13), Posi-Dmg/Rchg(13), Posi-Acc/Dmg/EndRdx(15), Posi-Dam%(15)
Level 6: Caltrops -- TmpRdns-EndRdx/Rchg/Slow(A), Slow-I(40)
Level 8: Combat Jumping -- LkGmblr-Rchg+(A)
Level 10: Targeting Drone -- GSFC-ToHit(A), GSFC-ToHit/Rchg(40), GSFC-ToHit/Rchg/EndRdx(43), GSFC-Rchg/EndRdx(43), GSFC-ToHit/EndRdx(46), GSFC-Build%(46)
Level 12: Maneuvers -- LkGmblr-Rchg+(A), HO:Enzym(17)
Level 14: Super Jump -- Zephyr-Travel(A), Zephyr-ResKB(37)
Level 16: Smoke Grenade -- HO:Lyso(A), HO:Lyso(23)
Level 18: Flamethrower -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(19), Posi-Dmg/Rchg(19), Posi-Acc/Dmg/EndRdx(21), Posi-Dam%(21)
Level 20: Cloaking Device -- LkGmblr-Rchg+(A)
Level 22: Assault -- EndRdx-I(A)
Level 24: M30 Grenade -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(25), Posi-Dmg/Rchg(25), Posi-Acc/Dmg/EndRdx(27), Posi-Dam%(27)
Level 26: Ignite -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(29), Posi-Dmg/Rchg(29), Posi-Acc/Dmg/EndRdx(31), Posi-Dam%(31)
Level 28: Beanbag -- Stpfy-Acc/Rchg(A), Stpfy-EndRdx/Stun(34), Stpfy-Acc/EndRdx(37), Stpfy-Stun/Rng(37), Stpfy-Acc/Stun/Rchg(40), Stpfy-KB%(43)
Level 30: Kick -- ExStrk-Dmg/KB(A), ExStrk-Acc/KB(36), ExStrk-Dam%(36)
Level 32: Full Auto -- Ragnrk-Dmg(A), Ragnrk-Dmg/Rchg(33), Ragnrk-Acc/Dmg/Rchg(33), Ragnrk-Acc/Rchg(33), Ragnrk-Knock%(34)
Level 35: Tough -- HO:Ribo(A), HO:Ribo(36)
Level 38: Gun Drone -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(39), Thundr-Dmg/Rchg(39), Thundr-Acc/Dmg/Rchg(39), Thundr-Acc/Dmg/EndRdx(42), Thundr-Dmg/EndRdx/Rchg(50)
Level 41: Charged Armor -- S'fstPrt-ResDam/Def+(A), HO:Ribo(42), HO:Ribo(42)
Level 44: Weave -- LkGmblr-Rchg+(A), HO:Enzym(45)
Level 47: Electrifying Fences -- TotHntr-Acc/Rchg(A), TotHntr-EndRdx/Immob(48), TotHntr-Acc/EndRdx(48), TotHntr-Immob/Acc(48), TotHntr-Acc/Immob/Rchg(50), TotHntr-Dam%(50)
Level 49: Vengeance -- LkGmblr-Rchg+(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- ULeap-Stlth(A)
Level 2: Rest -- RechRdx-I(A)
Level 1: Defiance
Level 4: Ninja Run
Level 2: Swift -- Run-I(A)
Level 2: Hurdle -- Jump-I(A)
Level 2: Health -- Numna-Regen/Rcvry+(A), Mrcl-Rcvry+(9)
Level 2: Stamina -- EndMod-I(A), EndMod-I(9)
O_O
I'll have a gander as soon as I can. Thanks! 
Sam: "My mind is a swirling miasma of scintillating thoughts and turgid ideas."
Max: "Me too."
Stuff
Okie dokie, my AR/Dev Blaster (A young genius inventor, hence the title
) is nearing 50, so I figured I'd see if I could figure out what to do for her actual build since she's spent the past half of her path to the big Five-Zero bumbling along on outlevelled IOs and SOs. 
What I walked away with was a headache.
So, since this is the first time I've actually succeeded in slapping something together in Mid's, there's a high likelihood that what I have right now, err, sucks (on an epic scale!), so I'm kind of looking for a few pointers right now. *begbeg*
I'm not overly certain what I want her to be, other than the fact that I'd like to get rid of both the "Why am I even here?" feelings when in a team and repeated faceplants every time I find I've failed to stock up on or used up all my Insps again when soloing.
Hero Plan by Mids' Hero Designer 1.90
http://www.cohplanner.com/
Click this DataLink to open the build!
Molly.EXE: Level 50 Technology Blaster
Primary Power Set: Assault Rifle
Secondary Power Set: Devices
Power Pool: Flight
Power Pool: Medicine
Ancillary Pool: Munitions Mastery
Hero Profile:
Level 1: Burst
- (A) Devastation - Accuracy/Damage
- (3) Devastation - Accuracy/Damage/Recharge
- (11) Devastation - Accuracy/Damage/Endurance/Recharge
- (17) Devastation - Chance of Hold
Level 1: Web Grenade- (A) Gravitational Anchor - Immobilize
- (5) Gravitational Anchor - Accuracy/Immobilize/Recharge
- (25) Gravitational Anchor - Chance for Hold
Level 2: Slug- (A) Devastation - Accuracy/Damage
- (3) Devastation - Accuracy/Damage/Recharge
- (19) Devastation - Accuracy/Damage/Endurance/Recharge
- (37) Devastation - Damage/Recharge
Level 4: Caltrops- (A) Pacing of the Turtle - Accuracy/Slow
- (5) Pacing of the Turtle - Range/Slow
- (29) Pacing of the Turtle - Chance of -Recharge
Level 6: Hover- (A) Freebird - Endurance
- (31) Freebird - FlySpeed
- (33) Freebird - +Stealth
Level 8: M30 Grenade- (A) Force Feedback - Damage/Knockback
- (9) Force Feedback - Accuracy/Knockback
- (21) Force Feedback - Recharge/Knockback
- (37) Force Feedback - Recharge/Endurance
- (45) Force Feedback - Damage/Endurance/Knockback
Level 10: Targeting Drone- (A) Gaussian's Synchronized Fire-Control - To Hit Buff
- (11) Gaussian's Synchronized Fire-Control - To Hit Buff/Endurance
- (27) Gaussian's Synchronized Fire-Control - Recharge/Endurance
- (46) Gaussian's Synchronized Fire-Control - Chance for Build Up
Level 12: Sniper Rifle- (A) Executioner's Contract - Accuracy/Damage
- (13) Executioner's Contract - Damage/Endurance
- (15) Executioner's Contract - Damage/Interrupt
- (23) Executioner's Contract - Damage/Range
- (34) Executioner's Contract - Damage/Recharge
- (36) Executioner's Contract - Disorient Bonus
Level 14: Fly- (A) Freebird - Endurance
- (15) Freebird - FlySpeed
Level 16: Smoke Grenade- (A) Dark Watcher's Despair - To Hit Debuff
- (17) Dark Watcher's Despair - Chance for Recharge Slow
- (31) Deflated Ego - Chance for Recovery Debuff
Level 18: Flamethrower- (A) Ragnarok - Damage
- (19) Ragnarok - Damage/Recharge
- (34) Ragnarok - Accuracy/Damage/Recharge
- (39) Ragnarok - Accuracy/Recharge
- (45) Ragnarok - Damage/Endurance
- (46) Ragnarok - Chance for Knockdown
Level 20: Cloaking Device- (A) Luck of the Gambler - Defense
- (21) Luck of the Gambler - Recharge Speed
Level 22: Aid Other- (A) Numina's Convalescence - Heal
- (23) Numina's Convalescence - Heal/Endurance/Recharge
- (37) Numina's Convalescence - +Regeneration/+Recovery
Level 24: Aid Self- (A) Panacea - Heal
- (25) Panacea - +Hit Points/Endurance
Level 26: Ignite- (A) Positron's Blast - Accuracy/Damage
- (27) Positron's Blast - Damage/Endurance
- (33) Positron's Blast - Damage/Recharge
- (43) Positron's Blast - Damage/Range
- (46) Positron's Blast - Accuracy/Damage/Endurance
Level 28: Trip Mine- (A) Armageddon - Damage
- (29) Armageddon - Damage/Recharge
- (42) Armageddon - Accuracy/Recharge
- (43) Armageddon - Chance for Fire Damage
Level 30: Resuscitate- (A) Miracle - Heal
- (31) Miracle - +Recovery
Level 32: Full Auto- (A) Positron's Blast - Accuracy/Damage
- (33) Positron's Blast - Damage/Endurance
- (34) Positron's Blast - Damage/Recharge
- (40) Positron's Blast - Damage/Range
- (40) Positron's Blast - Accuracy/Damage/Endurance
- (43) Positron's Blast - Chance of Damage(Energy)
Level 35: Buckshot- (A) Force Feedback - Damage/Endurance/Knockback
- (36) Force Feedback - Damage/Knockback
- (36) Force Feedback - Accuracy/Knockback
- (50) Force Feedback - Recharge/Endurance
- (50) Force Feedback - Chance for +Recharge
Level 38: Gun Drone- (A) Expedient Reinforcement - Accuracy/Damage
- (39) Expedient Reinforcement - Accuracy/Recharge
- (39) Expedient Reinforcement - Accuracy/Damage/Recharge
- (40) Expedient Reinforcement - Resist Bonus Aura for Pets
Level 41: Body Armor- (A) Aegis - Resistance
- (42) Aegis - Resistance/Endurance
- (42) Aegis - Psionic/Status Resistance
Level 44: Surveillance- (A) Analyze Weakness - Defense Debuff
- (45) Analyze Weakness - Chance for +ToHit
Level 47: LRM Rocket- (A) Air Burst - Accuracy/Damage
- (48) Air Burst - Damage/Endurance
- (48) Air Burst - Damage/Recharge
- (48) Air Burst - Damage/Range
Level 49: Sleep Grenade- (A) Fortunata Hypnosis - Sleep/Endurance
- (50) Fortunata Hypnosis - Chance for Placate
------------Level 1: Brawl
- (A) Hecatomb - Chance of Damage(Negative)
Level 1: Sprint- (A) Run Speed IO
Level 2: Rest- (A) Healing IO
- (7) Endurance Modification IO
- (7) Recharge Reduction IO
Level 1: DefianceLevel 4: Ninja Run
Level 2: Swift
- (A) Run Speed IO
Level 2: Hurdle- (A) Jumping IO
Level 2: Health- (A) Healing IO
- (13) Healing IO
Level 2: StaminaSam: "My mind is a swirling miasma of scintillating thoughts and turgid ideas."
Max: "Me too."
Stuff