Use one of the following item names with the spawn code.

Thompson with 30 round clip - weapons/us_thompson_30.hag
Thompson with 50 round drum - weapons/thompson.hag
Springfield sniper - weapons/springfield_m1903_sniper.hag
Springfield - weapons/us_springfield.hag
Shotgun - weapons/us_riot.hag
Garand - weapons/us_Garand.hag
Demo pack - weapons/us_demolitionpack.hag
Colt .45 - weapons/us_colt45.hag
Bar - weapons/us_bar.hag
Axe - weapons/us_axe.hag
.45 - weapons/us45.hag
Type 100 SMG - weapons/type100_smg.hag
Sword - weapons/sword.hag
Satchel charge - weapons/satchel_charge.hag
Reising - weapons/Reising.hag
Unknown - weapons/psyman.hag
Nambu - weapons/nambu_pistol.hag
Model 97 sniper - weapons/model97_sniper
Arisaka - weapons/m38_arisaka.hag
M2 grenade - weapons/m2frag_grenade.hag
M1 carbine - weapons/m1_carbine.hag
M96 LGM - weapons/jpn_model96lmg.hag
Japanese .44 - weapons/jpn_44.hag
Japanese grenade - weapons/jpnfrag_grenade.hag
Johnson LMG - weapons/Johnson.hag
Portable mortar - statweapons/model99_mortar_carryable.hag
Portable Lewis gun - statweapons/uslewis_single_carryable.hag
Anti-Tank gun - statweapons/usboys55_carryable.hag