There Ready For The Taking!
Sledgehammer Games has announced in a post on Reddit that they will start to add new weapon orders in Call Of Duty: WWII on a daily basis. This will give you the chance to earn the new weapons straight from daily orders.
Until now you have only been able to earn new weapon on a weekly basis. Sledgehammer Games has said that they will announce each week beforehand what weapon categories will be available that week so you have the chance to be able to go for them when their order is live.
This week the weapon categories you will be able to go for in the daily orders will be LMGs, Pistols, Shotguns, and Rifles.