This is a work in progress... but here's what I've gathered so far...
Weapons with Proficiences & Attachments
Assault Rifles
M4A1 - [default]
M16A4 - (3 round burst) [default]
SCAR-L - [Rank 6]
CM901 - [Rank 18]
Type 95 - (3 round burst) [Rank 32]
G36c - [Rank 42]
ACR 6.8 - [Rank 50]
MK14 - [Rank 60]
AK-47 - [Rank 68]
FAD - [Rank 78]
Proficiencies
Kick - [Level 4]
Impact - [Level 9]
2 Attachments - [Level 12]
Focus - [Level 16]
Breath - [Level 22]
Stability - [Level 28]
Attachments
Red Dot Sight - [Level 2]
Silencer - [Level 5]
M203/M320/GP25 Grenade Launcher - [Level 8]
ACOG Scope - [Level 11]
Heartbeat Sensor - [Level 14]
Holographic Sight - [Level 17]
Shotgun - [Level 20]
Hybrid Sights - [Level 23]
Extended Magazines - [Level 26]
Thermal Scope - [Level 29]
Submachine Guns
MP5 - [default]
UMP45 - [default]
PP90M1 - [Rank 28]
P90 - [Rank 38]
PM-9 - [Rank 56]
MP7 - [Rank 74]
Proficiencies
Kick - [Level 4]
Range - [Level 9]
2 Attachments - [Level 12]
Focus - [Level 15]
Melee - [Level 21]
Stability - [Level 28]
Attachments
Red Dot Sight - [Level 2]
Silencer - [Level 5]
Rapid Fire - [Level 11]
ACOG Scope - [Level 16]
Holographic Sight - [Level 19]
HAMR Sight - [Level 22]
Extended Magazines - [Level 24]
Thermal Scope - [Level 26]
Light Machine Guns
L86 LSW - [default]
MG36 - [default]
PKP Pecheneg - [Rank 14]
MK46 - [Rank 54]
M60E4 - [Rank 72]
Proficiencies
Kick - [Level 4]
Impact - [Level 9]
2 Attachments - [Level 12]
Focus - [Level 16]
Speed - [Level 21]
Stability - [Level 28]
Attachments
Red Dot Sight - [Level 2]
Silencer - [Level 5]
Grip - [Level 8]
Rapid FIre - [Level 11]
Heartbeat Sensor - [Level 20]
Holographic Sight - [Level 22]
Extended Magazines - [Level 25]
Thermal Scope - [Level 27]
Shotguns
USAS12 - (Full Auto) [Default]
KSG 12 - (Pump Action) [Default]
SPAS-12 - (Pump Action) [Rank 8]
AA- 12 - (Full Auto) [Rank 26]
Striker - (Semi-Auto) [Rank 48]
Model 1887 - (Lever-Action) [Rank 62]
Proficiencies
Kick - [Level 4]
Focus - [Level 9]
2 Attachments - [Level 14]
Melee - [Level 19]
Range - [Level 23]
Damage - [Level 28]
Attachments
Grip - [Level 2]
Silencer - [Level 5]
Red Dot Sight - [Level 12]
Holographic Sight - [Level 17]
Extended Magazines - [Level 26]
Sniper Rifles
Barrett .50 Cal - (Semi-Auto) [Default]
L118A - (Bolt Action) [Default]
Dragunov - (Semi-Auto) [Rank 12]
AS50 - (Semi-Auto) [Rank 22]
RSASS - (Semi-Auto) [Rank 44]
MSR - (Bolt Action) [Rank 66]
Proficiencies
Kick - [Level 4]
Impact - [Level 10]
2 Attachments - [Level 14]
Focus - [Level 18]
Speed - [Level 24]
Stability - [Level 28]
Attachments
ACOG Scope - [Level 2]
Silencer - [Level 5]
Heartbeat Sensor - [Level 13]
Extended Magazines - [Level 15]
Thermal - [Level 19]
Variable Zoom Scope - [Level 22]
Riot Shield - [Default]
Proficiencies
Melee - [Level 5]
Speed - [Level 10]
Secondary Weapons
Machine Pistols
FMG-9 - [Default]
MP9 - [Rank 16]
Skorpion - [Rank 36]
G18 - [Rank 70]
Attachments
Silencer - [Level 2]
Akimbo - [Level 5]
Red Dot Sight - [Level 7]
Holographic Sight - [Level 8]
Extended Magazines - [Level 10]
Pistols
USP .45 - [Default]
P99 - [Rank 10]
MP412 - (Revolver) [Rank 30]
.44 Magnum - (Revolver) [Rank 46]
Five Seven - [Rank 58]
Desert Eagle - [Rank 76]
Attachments for MP412, .44 Magnum, & Desert Eagle
Akimbo - [Level 5]
Tactical Knife - [Level 7]
Attachments for USP, P99, & FiveSeven
Silencer - [Level 2]
Akimbo - [Level 5]
Tactical Knife - [Level 7]
Extended Magazines - [Level 10]
Launchers
SMAW - (Free Fire/Vehicle Lockon) [Default]
Javelin - (Location/Vehicle Lockon) [Rank 24]
Stinger - (Vehicle Lockon Only) [Rank 40]
XM25 - (Airburst 25mm Grenade) [Rank 52]
M320 GLM (40 mm Grenade) - [Rank 64]
RPG - (Free Fire) [Rank 80]
Sight Reticules
Target Dot
Delta
U-Dot
Mil-Dot
Omega
Lambda
Weapon Proficiencies
Kick - Decrease the recoil while firing your primary
Range - Increase the effective range of your primary
Focus - Flinch less when shot and hit
Attachments - Allows two attachments on your primary
Melee - Increase the range and speed of your melee
Stability - Decrease the sway of the gun while ADS
Impact - Increases the bullet damage through materials
Speed - Allows faster movement while primary is equipped
Damage - Allows for more shotgun damage
Breath - Hold your breath while ADS
Camoflages & Unlock Level
A=Assault, S=SMG, Sh=Shotgun, L=LMG, Sn=Sniper
Classic; All guns at Level 3
Snow; A,L - 5 S,Sh,Sn - 6
Multi; A,L - 6 S,Sh - 7 Sn - 8
Digital; A,S,L - 8 Sh - 10 Sn - 11
Hex; A,S,L - 10 Sh - 11 Sn - 16
Choco; A,Sh,L - 13 S - 14 Sn - 20
Snake; A,S,Sh,L - 18 Sn - 23
Blue; A - 24, S - 25, Sh - 21, L - 23, Sn - 25
Red; A,S,Sh - 27 L,Sn - 26
Autumn; A - 30, S,Sh,L,Sn - 29
Gold; All guns at Level 31
Equipment
Lethal
Fragmentation Grenade - [Default]
Semtex Grenade - Sticky timed explosive grenade [Default]
Throwing Knife - Throw this at someone, it'll kill them [Rank 10]
Bouncing Betty - Springs up from ground before exploding [Rank 37]
Claymore - motion sensor activated [Rank 53]
C4 Pack - Player thrown and detonated explosive pack [Rank 67]
Tactical
Flash Grenade - [Default]
Concussion Grenade [Default]
Scrambler - Proximity based Radar Jammer [Rank 13]
EMP Grenade - Temporarily disables enemy equipment/killstreaks in affected area [Rank 21]
Smoke Grenade - Smoke screen Grenade [Rank 29]
Trophy System - Blocks and deflects enemy explosives [Rank 45]
Tactical Insertion - Allows player to choose where to respawn [Rank 61]
Portable Radar - Motion sensor radar [Rank 77]
Perks
Tier One
Recon - [Default] Paint enemy location on map with explosive damage
Pro - Paint enemy location on map with bullet damage
Sleight of Hand - [Default] Reload faster
Pro - Swap weapons faster
Blind Eye - [Rank 11] Undetectable by aircraft, sentries, & thermal
Pro - Allows faster lock onto aircraft
Extreme Conditioning - [Rank 22] Sprint longer distances
Pro - Climb obstacles faster
Scavenger - [Rank 39] Refill weapon ammunition from fallen enemies
Pro - Extra magazines
Tier Two
Quickdraw - [Default] Faster ADS
Pro - Recover from grenade and equipment use faster
Blast Shield - [Default] Take less damage from explosives
Pro - Immune to flash and stun grenades
Hardline - [Rank 15] Lessens amount of kills required to obtain killstreak reward
Pro - Allows two assists to count toward your killstreak
Assassin - [Rank 27] Immune to UAVs, heartbeat sensors, portable radar, & thermal
Pro - Immune to Counter UAV & EMPs
Overkill - [Rank 47] Allows two primary weapons
Pro - Allows you to put an attachment, proficiency & camo on your second primary weapon
Tier Three
Marksman - [Default] Identify enemies at longer range
Pro - Hold your breath longer while scoped
Stalker - [Default] Allows faster movement while aiming down sights
Pro - Delay enemy claymores
Sit Rep - [Rank 19] Paints placed enemy explosives bright red
Pro - Louder enemy footsteps
Steady Aim - [Rank 30] Increases hip-fire accuracy
Pro - Quickly aim down sights while sprinting
Dead Silence - [Rank 35] Quieted footsteps
Pro - Take no falling damage
Killstreaks
Killstreak Defaults
Assault: UAV, Predator Missile, & Helicopter
Support: UAV, Counter UAV, & Ballistic Vests
Specialist: Unlocked at Rank 20
Killstreak Unlock Levels
Rank 5, ... 36, 43, 65, 67, 73.... (forgot to keep track of these this Prestige...)
Assault Killstreaks - Killstreaks reset to zero upon death.
UAV - 3 kills
Care Package - 4 kills
IMS - 5 kills
Predator Missile - [Player Controlled missile, RT fires rocket afterburner] 5 kills
Sentry Gun - [Player Controlled] 5 kills
Precision Airstrike - 6 kills
Attack Helipcopter - 7 kills
Strafe Run - 9 kills
Little Bird Guard - 9 kills
Assault Drone - [Player Controlled] 10 kills
AC-130 - [Player Controlled] 12 kills
Pavelow - 12 kills
Juggernaut Armor - 15 kills
Osprey Gunner - [Player Controlled, drops 4 Care Packages] 17 kills
Support Killstreaks - Killstreaks DO NOT reset upon death, and will circle around again.
UAV - 4 kills
Counter UAV - 5 kills
Ballistic Vests - [drops vests for you and teammates] 5 kills
Airdrop Trap - [drops a boobytrapped care package] 5 kills
Sam Turret - 8 kills
Recon Drone - [Player Controlled mini helicopter used to target enemies] 10 kills
Remote Turret - [Player Controlled Sentry Gun] 12 kills
Stealth Bomber - 14 kills
EMP - 18 kills
Juggernaut Recon - [Armor + Riot shield] 18 kills
Escort Airdrop - [Osprey Gunship that drops 4 care packages and watches over area] 18 kills
Specialist Killstreaks
Allows you to choose extra Perks to use for your class after 2, 4, & 6 kills. An 8 killstreak will give you all perks at the same time.
Death Streaks
Juiced - 4 deaths [Default] (Allows faster movement for short period of time)
Final Stand - 4 deaths [Level 15] (puts you down and allows use of main gun, you will stand up if not shot again)
Martyrdom - 4 deaths [Level 32] (drop live grenade upon death)
Revenge - 5 deaths [Level 51] (Icon on screen shows location of last player to kill you)
Deadmans Hand - 6 deaths [Level 57] (pull out C4 detonator before dying)
Hollow Point - 8 deaths [Level 71] (Increased bullet damage)
MW3 Maps
Arkaden
Bakaara
Bootleg
Carbon
Dome
Downturn
Fallen
Hardhat
Interchange
Lockdown
Mission
Outpost
Resistance
Seatown
Underground
Village
Weapons with Proficiences & Attachments
Assault Rifles
M4A1 - [default]
M16A4 - (3 round burst) [default]
SCAR-L - [Rank 6]
CM901 - [Rank 18]
Type 95 - (3 round burst) [Rank 32]
G36c - [Rank 42]
ACR 6.8 - [Rank 50]
MK14 - [Rank 60]
AK-47 - [Rank 68]
FAD - [Rank 78]
Proficiencies
Kick - [Level 4]
Impact - [Level 9]
2 Attachments - [Level 12]
Focus - [Level 16]
Breath - [Level 22]
Stability - [Level 28]
Attachments
Red Dot Sight - [Level 2]
Silencer - [Level 5]
M203/M320/GP25 Grenade Launcher - [Level 8]
ACOG Scope - [Level 11]
Heartbeat Sensor - [Level 14]
Holographic Sight - [Level 17]
Shotgun - [Level 20]
Hybrid Sights - [Level 23]
Extended Magazines - [Level 26]
Thermal Scope - [Level 29]
Submachine Guns
MP5 - [default]
UMP45 - [default]
PP90M1 - [Rank 28]
P90 - [Rank 38]
PM-9 - [Rank 56]
MP7 - [Rank 74]
Proficiencies
Kick - [Level 4]
Range - [Level 9]
2 Attachments - [Level 12]
Focus - [Level 15]
Melee - [Level 21]
Stability - [Level 28]
Attachments
Red Dot Sight - [Level 2]
Silencer - [Level 5]
Rapid Fire - [Level 11]
ACOG Scope - [Level 16]
Holographic Sight - [Level 19]
HAMR Sight - [Level 22]
Extended Magazines - [Level 24]
Thermal Scope - [Level 26]
Light Machine Guns
L86 LSW - [default]
MG36 - [default]
PKP Pecheneg - [Rank 14]
MK46 - [Rank 54]
M60E4 - [Rank 72]
Proficiencies
Kick - [Level 4]
Impact - [Level 9]
2 Attachments - [Level 12]
Focus - [Level 16]
Speed - [Level 21]
Stability - [Level 28]
Attachments
Red Dot Sight - [Level 2]
Silencer - [Level 5]
Grip - [Level 8]
Rapid FIre - [Level 11]
Heartbeat Sensor - [Level 20]
Holographic Sight - [Level 22]
Extended Magazines - [Level 25]
Thermal Scope - [Level 27]
Shotguns
USAS12 - (Full Auto) [Default]
KSG 12 - (Pump Action) [Default]
SPAS-12 - (Pump Action) [Rank 8]
AA- 12 - (Full Auto) [Rank 26]
Striker - (Semi-Auto) [Rank 48]
Model 1887 - (Lever-Action) [Rank 62]
Proficiencies
Kick - [Level 4]
Focus - [Level 9]
2 Attachments - [Level 14]
Melee - [Level 19]
Range - [Level 23]
Damage - [Level 28]
Attachments
Grip - [Level 2]
Silencer - [Level 5]
Red Dot Sight - [Level 12]
Holographic Sight - [Level 17]
Extended Magazines - [Level 26]
Sniper Rifles
Barrett .50 Cal - (Semi-Auto) [Default]
L118A - (Bolt Action) [Default]
Dragunov - (Semi-Auto) [Rank 12]
AS50 - (Semi-Auto) [Rank 22]
RSASS - (Semi-Auto) [Rank 44]
MSR - (Bolt Action) [Rank 66]
Proficiencies
Kick - [Level 4]
Impact - [Level 10]
2 Attachments - [Level 14]
Focus - [Level 18]
Speed - [Level 24]
Stability - [Level 28]
Attachments
ACOG Scope - [Level 2]
Silencer - [Level 5]
Heartbeat Sensor - [Level 13]
Extended Magazines - [Level 15]
Thermal - [Level 19]
Variable Zoom Scope - [Level 22]
Riot Shield - [Default]
Proficiencies
Melee - [Level 5]
Speed - [Level 10]
Secondary Weapons
Machine Pistols
FMG-9 - [Default]
MP9 - [Rank 16]
Skorpion - [Rank 36]
G18 - [Rank 70]
Attachments
Silencer - [Level 2]
Akimbo - [Level 5]
Red Dot Sight - [Level 7]
Holographic Sight - [Level 8]
Extended Magazines - [Level 10]
Pistols
USP .45 - [Default]
P99 - [Rank 10]
MP412 - (Revolver) [Rank 30]
.44 Magnum - (Revolver) [Rank 46]
Five Seven - [Rank 58]
Desert Eagle - [Rank 76]
Attachments for MP412, .44 Magnum, & Desert Eagle
Akimbo - [Level 5]
Tactical Knife - [Level 7]
Attachments for USP, P99, & FiveSeven
Silencer - [Level 2]
Akimbo - [Level 5]
Tactical Knife - [Level 7]
Extended Magazines - [Level 10]
Launchers
SMAW - (Free Fire/Vehicle Lockon) [Default]
Javelin - (Location/Vehicle Lockon) [Rank 24]
Stinger - (Vehicle Lockon Only) [Rank 40]
XM25 - (Airburst 25mm Grenade) [Rank 52]
M320 GLM (40 mm Grenade) - [Rank 64]
RPG - (Free Fire) [Rank 80]
Sight Reticules
Target Dot
Delta
U-Dot
Mil-Dot
Omega
Lambda
Weapon Proficiencies
Kick - Decrease the recoil while firing your primary
Range - Increase the effective range of your primary
Focus - Flinch less when shot and hit
Attachments - Allows two attachments on your primary
Melee - Increase the range and speed of your melee
Stability - Decrease the sway of the gun while ADS
Impact - Increases the bullet damage through materials
Speed - Allows faster movement while primary is equipped
Damage - Allows for more shotgun damage
Breath - Hold your breath while ADS
Camoflages & Unlock Level
A=Assault, S=SMG, Sh=Shotgun, L=LMG, Sn=Sniper
Classic; All guns at Level 3
Snow; A,L - 5 S,Sh,Sn - 6
Multi; A,L - 6 S,Sh - 7 Sn - 8
Digital; A,S,L - 8 Sh - 10 Sn - 11
Hex; A,S,L - 10 Sh - 11 Sn - 16
Choco; A,Sh,L - 13 S - 14 Sn - 20
Snake; A,S,Sh,L - 18 Sn - 23
Blue; A - 24, S - 25, Sh - 21, L - 23, Sn - 25
Red; A,S,Sh - 27 L,Sn - 26
Autumn; A - 30, S,Sh,L,Sn - 29
Gold; All guns at Level 31
Equipment
Lethal
Fragmentation Grenade - [Default]
Semtex Grenade - Sticky timed explosive grenade [Default]
Throwing Knife - Throw this at someone, it'll kill them [Rank 10]
Bouncing Betty - Springs up from ground before exploding [Rank 37]
Claymore - motion sensor activated [Rank 53]
C4 Pack - Player thrown and detonated explosive pack [Rank 67]
Tactical
Flash Grenade - [Default]
Concussion Grenade [Default]
Scrambler - Proximity based Radar Jammer [Rank 13]
EMP Grenade - Temporarily disables enemy equipment/killstreaks in affected area [Rank 21]
Smoke Grenade - Smoke screen Grenade [Rank 29]
Trophy System - Blocks and deflects enemy explosives [Rank 45]
Tactical Insertion - Allows player to choose where to respawn [Rank 61]
Portable Radar - Motion sensor radar [Rank 77]
Perks
Tier One
Recon - [Default] Paint enemy location on map with explosive damage
Pro - Paint enemy location on map with bullet damage
Sleight of Hand - [Default] Reload faster
Pro - Swap weapons faster
Blind Eye - [Rank 11] Undetectable by aircraft, sentries, & thermal
Pro - Allows faster lock onto aircraft
Extreme Conditioning - [Rank 22] Sprint longer distances
Pro - Climb obstacles faster
Scavenger - [Rank 39] Refill weapon ammunition from fallen enemies
Pro - Extra magazines
Tier Two
Quickdraw - [Default] Faster ADS
Pro - Recover from grenade and equipment use faster
Blast Shield - [Default] Take less damage from explosives
Pro - Immune to flash and stun grenades
Hardline - [Rank 15] Lessens amount of kills required to obtain killstreak reward
Pro - Allows two assists to count toward your killstreak
Assassin - [Rank 27] Immune to UAVs, heartbeat sensors, portable radar, & thermal
Pro - Immune to Counter UAV & EMPs
Overkill - [Rank 47] Allows two primary weapons
Pro - Allows you to put an attachment, proficiency & camo on your second primary weapon
Tier Three
Marksman - [Default] Identify enemies at longer range
Pro - Hold your breath longer while scoped
Stalker - [Default] Allows faster movement while aiming down sights
Pro - Delay enemy claymores
Sit Rep - [Rank 19] Paints placed enemy explosives bright red
Pro - Louder enemy footsteps
Steady Aim - [Rank 30] Increases hip-fire accuracy
Pro - Quickly aim down sights while sprinting
Dead Silence - [Rank 35] Quieted footsteps
Pro - Take no falling damage
Killstreaks
Killstreak Defaults
Assault: UAV, Predator Missile, & Helicopter
Support: UAV, Counter UAV, & Ballistic Vests
Specialist: Unlocked at Rank 20
Killstreak Unlock Levels
Rank 5, ... 36, 43, 65, 67, 73.... (forgot to keep track of these this Prestige...)
Assault Killstreaks - Killstreaks reset to zero upon death.
UAV - 3 kills
Care Package - 4 kills
IMS - 5 kills
Predator Missile - [Player Controlled missile, RT fires rocket afterburner] 5 kills
Sentry Gun - [Player Controlled] 5 kills
Precision Airstrike - 6 kills
Attack Helipcopter - 7 kills
Strafe Run - 9 kills
Little Bird Guard - 9 kills
Assault Drone - [Player Controlled] 10 kills
AC-130 - [Player Controlled] 12 kills
Pavelow - 12 kills
Juggernaut Armor - 15 kills
Osprey Gunner - [Player Controlled, drops 4 Care Packages] 17 kills
Support Killstreaks - Killstreaks DO NOT reset upon death, and will circle around again.
UAV - 4 kills
Counter UAV - 5 kills
Ballistic Vests - [drops vests for you and teammates] 5 kills
Airdrop Trap - [drops a boobytrapped care package] 5 kills
Sam Turret - 8 kills
Recon Drone - [Player Controlled mini helicopter used to target enemies] 10 kills
Remote Turret - [Player Controlled Sentry Gun] 12 kills
Stealth Bomber - 14 kills
EMP - 18 kills
Juggernaut Recon - [Armor + Riot shield] 18 kills
Escort Airdrop - [Osprey Gunship that drops 4 care packages and watches over area] 18 kills
Specialist Killstreaks
Allows you to choose extra Perks to use for your class after 2, 4, & 6 kills. An 8 killstreak will give you all perks at the same time.
Death Streaks
Juiced - 4 deaths [Default] (Allows faster movement for short period of time)
Final Stand - 4 deaths [Level 15] (puts you down and allows use of main gun, you will stand up if not shot again)
Martyrdom - 4 deaths [Level 32] (drop live grenade upon death)
Revenge - 5 deaths [Level 51] (Icon on screen shows location of last player to kill you)
Deadmans Hand - 6 deaths [Level 57] (pull out C4 detonator before dying)
Hollow Point - 8 deaths [Level 71] (Increased bullet damage)
MW3 Maps
Arkaden
Bakaara
Bootleg
Carbon
Dome
Downturn
Fallen
Hardhat
Interchange
Lockdown
Mission
Outpost
Resistance
Seatown
Underground
Village
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