Type /developer 2 in the console before starting the map

MR6: pistol_standard
RK5: pistol_burst
L-CAR: pistol_fullauto
Kuda: smg_standard
VMP: smg_versatile
Weevil: smg_capacity
Vesper: smg_fastfire
Pharo: smg_burst
Razorback: smg_longrange
Bootlegger: smg_sten
KN-44: ar_standard
HVK-30: ar_cqb
ICR-1: ar_accurate
Man-o-war: ar_damage
Sheiva: ar_marksman
M8A7: ar_longburst
KRM-262: shotgun_pump
205 Brecci: shotgun_semiauto
Haymaker 12: shotgun_fullauto
Argus: shotgun_precision
BRM: lmg_light
Dingo: lmg_cqb
Gorgon: lmg_slowfire
48 Dredge: lmg_heavy
Drakon: sniper_fastsemi
Locus: sniper_fastbolt
SVG-100: sniper_powerbolt
XM-53: launcher_standard
Marshal 16: pistol_shotgun_dw
Rift E9: pistol_energy
Razorback: smg_longrange
HG-40: smg_mp40
PPSh-41: smg_ppsh
M1927: smg_m1927
MX Garand: ar_garand
FFAR: ar_famas
Peacekeeper MK2: ar_peacekeeper
Banshii: shotgun_energy
L4 Siege: launcher_multi
NX Shadowclaw: special_crossbow_dw
*SOE Only*
Bloodhound: pistol_revolver38
Bootlegger: smg_sten
Apthicon Servant: Idgun_1
*DE Only*
Bow: elemental_bow
Storm Bow: elemental_bow_storm
Void Bow: elemental_bow_demongate
Fire Bow: elemental_bow_rune_prison
Wolf Bow: elemental_bow_wolf_howl
*ZNS Only*
MX Garand: ar_garand (also on GK)
HG-40: smg_mp40 (also on GK)
Razorback: smg_longrange
Marshal 16: pistol_shotgun_dw
KT-4: hero_mirg2000
Masamune: hero_mirg2000_upgraded_2
GK Only
PPSh-41: smg_ppsh
MX Garand: ar_garand (also on ZNS)
HG-40: smg_mp40 (also on ZNS)
L4 Siege: launcher_multi
FFAR: ar_famas
Ray Gun Mark 3: not known, feel free to post in comments.
*Misc.*
Default Weapon: defaultweapon
Death Machine: minigun
Bowie Knife: bowie_knife
Wonder Weapons
Ray Gun: ray_gun
Waffle: Tesla_gun
Bow: elemental_bow
Storm Bow: elemental_bow_storm
Void Bow: elemental_bow_demongate
Fire Bow: elemental_bow_rune_prison
Wolf Bow: elemental_bow_wolf_howl
Apthicon Servant: Idgun_1
Masamune: hero_mirg2000_upgraded_2
*Paped guns*
PAP: GUNNAME_Upgraded
PAP(IDGUN): ad _1 to the end
*SMALL LIST OF DLC GUNS*
New Smg Nailgun: smg_nailgun
Diskgun Thing: special_discgun
Chansaw glove: melee_chainsaw
♥♥♥♥♥♥♥ arm thing: melee_prosthetic