Manufacturing unit blanks are sometimes out there but hard to find. I don’t see blank ammo listed in any from the countrywide catalogs that checklist Are living ammo. Now after which you can Aged Western Scrounger has several although not in every single caliber. Navy Arms sells five in 1 https://strapweaponshop.com/product/triple-r-munitions-223-5-56-nato-blanks-100-rounds/