Unknown Rifle Barrel

#5972 24" Large Ring Mauser rifle barrel in something labeled 6mm MAC?

Mauser Sporter Stock Walnut Mauser Sporter Rifle Stock

#5976 20" Small Ring Mauser barrel in 7mm by CR Pedersen & son Nice bore

Mauser Military Rifle Barrel 7MM 7x57mm w/ Front Sight & Threads

.358 Winchester 22” Rifle Barrel, Clean Bore, Unknown Fitment

#5978 21-1/4" CUT Ruger 77 barrel 270 caliber, small ring Mauser thread

Vintage gunsmith estate Mauser SKS sportster? T336 Hallmark 4979 rifle barrel