Haven't seen any lists like this so I figured I'd make one.
Assault Rifles:

M4A1: LVL 4

M16A4:LVL 4

SCAR-L: LVL 6

CM901: LVL 18

Type 95: LVL 32

G36C: LVL 42

ACR 6.8: LVL 50

MK 14: LVL 60

Ak-47: LVL 68

FAD: LVL 78

SMG:

MP5: LVL 4

UMP45: LVL 4

PP90M1: LVL 28

P90: LVL 38

PM-9: LVL 56

MP7: LVL 74

LMG:

L86 LSW: LVL 4

MG36: LVL 4

PKP Pecheneg: LVL 14

MK46: LVL 54

M60E4: LVL 72

Shotguns:

USAS 12: LVL 4

KSG12: LVL 4

SPAS-12: LVL 8

AA-12: LVL 26

Striker: LVL 48

Model 1887: LVL 62

Sniper Rifles:

Barrett .50Cal: LVL 4

L118A: LVL 4

Dragunov: LVL 12

AS50: LVL 22

RSASS: LVL 44

MSR: LVL 66

Riot Sheild

Riot Shield: LVL 4


Secondaries:

Machine Pistols:

FMG9: LVL 4

MP9: LVL 16

Skorpion: LVL 36

G18: LVL 70

Handguns:

USP .45: LVL 4

P99: LVL 10

MP412: LVL 30

.44 Magnum: LVL 46

Five Seven: LVL 58

Desert Eagle: LVL 76

Launchers:

SMAW: LVL 4

Javelin: LVL 24

Stinger: LVL 40

XM25: LVL 52

M320 GLM: LVL 64

RPG-7: LVL 80


Lethal:

Frag: LVL 4

Semtex: LVL 4

Throwing Knife: LVL 5

Bouncing Betty: LVL 37

Claymore: LVL 53

C4: LVL 69


Tactical:

Flash Grenade: LVL 4

Stun Grenade: LVL 4

Scrambler: LVL 13

EMP Grenade LVL 21

Smoke Grenade: LVL 29

Trophy System: LVL 45

Tactical Insertion: LVL 61

Portable Radar: LVL 77

Perks:

Tier 1:

Recon: LVL 4

Sleight of Hand: LVL 4

Blind Eye: LVL 11

Extreme Conditioning: LVL 22

Scavenger: LVL 39

Tier 2:

Quickdraw: LVL 4

Blast Shield: LVL 4

Hardline: LVL 15

Assassin: LVL 27

Overkill: LVL 47

Tier 3:

Marksman: LVL 4

Stalker: LVL 4

Sitrep: LVL 19

Steady Aim: LVL 30

Dead Silence: LVL 55

Weapon Proficiencies:

Assault Rifles:

Kick: Weapon LVL 4

Impact: Weapon LVL 9

Attachments: Weapon LVL 12

Focus: Weapon LVL 16

Breath: Weapon LVL 22

Stability: Weapon LVL 28

SMG:

Kick: Weapon LVL 4

Range: Weapon LVL 9

Attachments: Weapon LVL 12

Focus: Weapon LVL 15

Melee: Weapon LVL 21

Stability: Weapon LVL 28

LMG:

Kick: Weapon LVL 4

Impact: Weapon LVL 9

Attachmetns: Weapon LVL 12

Focus: Weapon LVL 16

Speed: Weapon LVL 21

Stability: Weapon LVL 28

Shotguns:

Kick: Weapon LVL 4

Focus: Weapon LVL 9

Attachments: Weapon LVL 14

Melee: Weapon LVL 19

Range: Weapon LVL 23

Damage: Weapon LVL 28

Sniper Rifles:

Kick: Weapon LVL 4

Impact: Weapon LVL 10

Attachments: Weapon LVL 14

Focus: Weapon LVL 18

Speed: Weapon LVL 24

Stability: Weapon LVL 28

Riot Shield:

Melee: Weapon LVL 5

Speed: Weapon LVL 10


Attachments:

Assault Rifles:

Red Dot: Weapon LVL 2

Silencer: Weapon LVL 5

Grenade Launcher: Weapon LVL 8

ACOG: Weapon LVL 11

Heartbeat Sensor: Weapon LVL 14

Hybrid Sight: Weapon LVL 17

Shotgun: Weapon LVL 20

Holographic: Weapon LVL 23

Extended Mags: Weapon LVL 26

Thermal: Weapon LVL 29

SMG:

Red Dot: Weapon LVL 2

Silencer: Weapon LVL 5

Rapid Fire: Weapon LVL 11

ACOG: Weapon LVL 16

HAMR Scope: Weapon LVL 19

Holographic: Weapon LVL 22

Extended Mags: Weapon LVL 24

Thermal: Weapon LVL 26

LMG:

Red Dot: Weapon LVL 2

Silencer: Weapon LVL 5

Grip: Weapon LVL 8

ACOG: Weapon LVL 11

Rapid Fire: Weapon LVL 14

Heartbeat Sensor: Weapon LVL 20

Holographic: Weapon LVL 22

Extended Mags: Weapon LVL 25

Thermal: Weapon LVL 27

Shotgun:

Grip: Weapon LVL 2

Silencer: Weapon LVL 5

Red Dot: Weapon LVL 12

Holographic: Weapon LVL 17

Extended Mags: Weapon LVL 26

Sniper Rifles:

ACOG: Weapon LVL 2

Silencer: Weapon LVL 5

Extended Mags: Weapon LVL 13

Heartbeat Sensor: Weapon LVL 15

Thermal: Weapon LVL 19

Variable Zoom: Weapon LVL 22

Machine Pistols: (Proficiency might only go to level 10??)

Silencer: Weapon LVL 2

Akimbo: Weapon LVL 5

Holographic: Weapon LVL 7

Red Dot: Weapon LVL 8

Extended Mags: Weapon LVL 10

Handguns: (Proficiency might only go to level 10??)

Silencer: Weapon LVL 2

Akimbo: Weapon LVL 5

Tactical Knife: Weapon LVL 7

Extended Mags: Weapon LVL 10

Launchers: (No attachments but do have proficiency....not sure what for??)


Camo (Roughly):

Classic: Weapon LVL 3

Snow: Weapon LVL 6

Multicam: Weapon LVL 8

Digital Urban: Weapon LVL 11

Hex: Weapon LVL 16

Choco: Weapon LVL 20

Snake: Weapon LVL 23

Blue: Weapon LVL 25

Red: Weapon LVL 26

Autumn: Weapon LVL 29

Gold: Weapon LVL 31

Reticles:

Target Dot: Weapon LVL 9

Delta: Weapon LVL 13

U-Dot: Weapon LVL 17

MIL-Dot: Weapon LVL 20

Omega: Weapon LVL 23

Lambda: Weapon LVL 30

Thank the topic!