First and foremost, these item ID's can only do anything for you if you can edit your Wasteland 2 save files or have another method of using the codes. Saves can be edited as XML files using a text editor such as Notepad++, or there are dedicated save editors.

I personally use a mod on the Nexus that adds an in-game cheat menu, linked here.

Cheat Menu at Wasteland 2 Nexus[www.nexusmods.com]

Do note that item IDs are case-sensitive.

HANDGUNS:

Handgun_Tier_1_1 - VP912: 6-9, 3b, .38
Handgun_Tier_1_2 - Navy Rev: 9-14, 3b, .38
Handgun_Tier_1_3 - P38: 7-12, 3b, .38
Handgun_Tier_2_1 - Makarov: 8-13, 3b, .38
Handgun_Tier_2_2 - Midnight Rev: 6-10, 3b, .38
Handgun_Tier_3_1 - .38 Rev: 15-18, 3b, .38
Handgun_Tier_3_2 - Beretta: 14-27, 3b, 9mm
Handgun_Tier_4_1 - Glock17: 14-19, 3b, 9mm
Handgun_Tier_4_2 - Peace Rev: 28-40, 3b, .45
Handgun_Tier_5_1 - Widow Rev: 16-19, 3b, .45
Handgun_Tier_5_2 - Glock19: 11-13, 3b, 9mm
Handgun_Tier_6_1 - Deagle: 32-36, 3b, .45
Handgun_Tier_6_2 - 1911: 16-20, 3b, .45

SMG:

SMG_Tier_1_1 - MP40: 6-9x3, 4b, .38
SMG_Tier_1_2 - Sten: 5-6x3, 4b, .38
SMG_Tier_1_3 - Mk27: 8-11x3, 4b, .38
SMG_Tier_2_1 - Skorpion: 22-27x3, 4b, .38
SMG_Tier_2_2 - PPSH: 20-36x4, 2b, .38
SMG_Tier_3_1 - UZI: 14-18x3, 4b, 9mm
SMG_Tier_3_2 - Mac17: 10-20x5, 3b, .45
SMG_Tier_4_1 - TMP: 8-12x3, 5b, 9mm
SMG_Tier_4_2 - Thompson: 8-12x5, 5b, .45
SMG_Tier_5_1 - MP5K: 7-10x3, 5b, 9mm
SMG_Tier_5_2 - UMP9: 9-10x3, 5b, .45
SMG_Tier_6_1 - MP5AR: 15-18x3, 5b, .45
SMG_Tier_6_2 - AR-45: 28-36x?, 5b, .45
SMG_Tier_1_1_BadAttitude

ShotGun:

Shotgun_Tier_1_1 - pump. 14-18.5b.15m
Shotgun_Tier_1_2 - sawoff 13-16 4b 9m
Shotgun_Tier_2_1 - coach, 21-28, 5b, 12m
Shotgun_Tier_2_2 - leveraction 18-34 6b 10m
Shotgun_Tier_3_1 - M37 28-38 5b 14m
Shotgun_Tier_3_2 - SOSG 18-24 5b 14m
Shotgun_Tier_4_1 - overunder 21-28 5b 13m
Shotgun_Tier_5_1 - holdup 21-25 5b 13m
Shotgun_Tier_5_2 - tactical 20-30 5b 13m
Shotgun_Tier_6_1 - SPAZ 50-60 5b 13m
Shotgun_Tier_6_2 - jackhammer 25-30 5b 13m

AssaultRifle:

AssaultRifle_Tier_1_1 - m1 6-10 8 556
AssaultRifle_Tier_1_2 - m14 7-13 9 556
AssaultRifle_Tier_1_3 - rusty 10-14 7 556
AssaultRifle_Tier_2_1 - M4 18-29 8 556
AssaultRifle_Tier_2_2 - Famas 12-17 8 556
AssaultRifle_Tier_3_1 - HK33 15-19 8 556
AssaultRifle_Tier_3_2 - M16 18-23 8 556
AssaultRifle_Tier_4_1 - AK47 30-38 5 762
AssaultRifle_Tier_4_2 - AUG 17-22 5 556
AssaultRifle_Tier_5_1 - G3 18-23 5 762
AssaultRifle_Tier_5_2 - AK97 36-40 9 762
AssaultRifle_Tier_6_1 - FAL 21-25 5 762
AssaultRifle_Tier_6_2 - G41 22-28 5 762

Sniper:

Sniper_Tier_1_1 - Hunting 12-16 8 3006
Sniper_Tier_1_2 - R270 12-22 8 3006
Sniper_Tier_1_3 - m40 14-17 8 3006
Sniper_Tier_2_1 - G43 21-28 8 3006
Sniper_Tier_2_2 - SKS 18-26 8 3006
Sniper_Tier_3_1 - type88 30-34 8 3006
Sniper_Tier_3_2 - M24 34-40 8 3006
Sniper_Tier_4_1 - SR2000 30-38 5 762
Sniper_Tier_4_2 - SVV 35_45 30 762
Sniper_Tier_5_1 - AWP 41_47 30 762
Sniper_Tier_5_2 - SVD 40-50 8 762
Sniper_Tier_6_1 - PSG 40-55 30 762
Sniper_Tier_6_2 - M82 40-60 30 50s

Machinegun:

MachineGun_Tier_1_1 - M2 3-5x8 556
MachineGun_Tier_2_1 - Bren 9-11x5 556
MachineGun_Tier_3_1 - bar 10-13x6 556
MachineGun_Tier_4_1 - m60 14-18x5 762
MachineGun_Tier_5_1 - SAW 15-20x6 762
MachineGun_Tier_6_1 - minigun 12-15x10 762

Energy:

Energy_Tier_1_1 - Phase Blaster 4-6
Energy_Tier_1_2 - Laser Carbine 5-7
Energy_Tier_2_1 - Laser Pistol 6-9
Energy_Tier_2_2 - Ion Beamer 8-13
Energy_Tier_3_1 - Pulse Rifle 14-18
Energy_Tier_3_2 - Meson Cannon 13-16
Energy_Tier_4_1 - Plasma Beamer 18-22
Energy_Tier_4_2 - Ion Blaster 18-22
Energy_Tier_5_1 - Photon Cannon 25-30
Energy_Tier_5_2 - Neutron Projector 25-30
Energy_Tier_6_1 - Ion Lance 30-35
Energy_Tier_6_2 - Death Ray 30-35
Energy_Toaster_Gamma_Ray

Melee:

Bladed_Tier_6_2 - Proton Axe
Blunt_Tier_6_2 - Plasma Hammer
Brawling_Tier_6_1 - Dragon Claw
Bladed_Tier_1_1_SHUModel

Rocket Launcher:
AntiTank_Tier_1_1
AntiTank_Tier_2_1
AntiTank_Tier_3_1
AntiTank_Tier_4_1
AntiTank_Tier_5_1

Ammo:
Ammo_.38_S
Ammo_9mm_S
Ammo_.45_S
Ammo_.30-06_S
Ammo_5.56mm_S
Ammo_7.62mm_S
Ammo_.50_S
Ammo_12-00
Ammo_EnergyCell

Note that .38, .45, .30-06, and .50 all have a period before the first number, while 5.56 and 7.62 have a period after the first number.

Mods:
Mod_Barrel_FlashSuppressor
Mod_Barrel_Long
Mod_Barrel_Short
Mod_Barrel_Silencer
Mod_Barrel_Toaster
Mod_LaserSight
Mod_Magazine_Long
Mod_Magazine_Quick
Mod_Magazine_Sturdy
Mod_MeleeGrip_Leather
Mod_MeleeGrip_Tape
Mod_MeleeWeight_Grand_Slam
Mod_MeleeWeight_Heavy
Mod_MeleeWeight_Light
Mod_MeleeWeight_Toaster
Mod_Scope_BackerMate
Mod_Scope_Large
Mod_Scope_Small
Mod_Scope_Tactical
Mod_Scope_Toaster
Mod_Silencer
Mod_UnderBarrel_Flashlight
Mod_UnderBarrel_Laser
Mod_Choke_Full
Mod_Choke_Improved
Mod_Choke_Open
Mod_Choke_Toaster

Note: Changed spelling and capitalization to what I have confirmed works for certain weapon mods I've spawned myself, and for others which I presume follow the same capitalization and spelling conventions. Let me know which specific ones do not work and I'll try to update if I can confirm a working command.

Armor:
Armor_Tier_6_Light
Armor_Tier_6_Heavy
Wearable_RadSuit_Level_6

Useful Items:
Usable_BloodPack_6 - Medic Pack
Useable_Surgeon_Kit_3 - Master Trauma Kit
Usable_AntiVenom_1 - Anti-venom
Useable_Antibiotics_1 - Antibiotics
Usable_Smokes_CoffinNails
Usable_Smokes_NicoPops
Usable_Smokes_RedRooster
Usable_Smokes_Styx
Usable_Smokes_Bones

Quest Items:
Ag Center Serum - Quest item/cure for the infection
FindleyTekTread - Tracks for the robot near the prison