Just use comand /give with these ids (you have to take all these guns) and modify in craft menu with buffle kit

/give buffle (buffle kit)

Government: 51213
Asset: 51203
Bisey: 51228
Tonijn: 51233
Cryogen-12: 51235
RSS-03: 51237 -
Bluntforce-12: 51240
Centare: 51242
Tanto: 51244
M1911: 51227
Private: 51205
ECS-25: 51216
CSO-85: 51208
Ulfberht: 51220
Kompact: 51229
Empey: 51223
Uzey: 51222
Nacht: 51219
Tempest: 51322
Frostbite-Aozora: 52302
Sundoor Submachine Gun: 51321
Rostbite Sniper Rifle: 52300
CSO-85-BLK: 52061
Centare “wilde cherry”: 52063
Private “greenback”: 52065
Falcon .50: 51217
Raumfahrer Ulfberht: 52068
Silver Asset: 52070
Thallium Sundoor: 52074
Palladium Tonijn: 52076
Iridium Tanto: 52072
ECS-25-BLK: 51289
Government “Vaquero”: 51294
Valhalla SGNL-512: 51296
Tukavtomat: 51247
Intragat: 52286

51292 - M1911 "Accelerator
Tukavtomat OZT. (52432
Classic Bluntforce-12. (52363
51296 - Valhalla SGNL-512
Empay submachinegun. (52237
Bauarbeiter Empey. (52439
Empey 51223
52076 - Palladium Tonijn
Liberator battle rifle. (52430
51217 - Falcon .50
51291 - Golden Falcon
Sängerin Kompact. (52445
52300 - Frostbite
Blumengeschäft Nacht. (52448
Gryaz Bisey. (52450
Strelok Intragat. (52441
51222 - Uzey