Best switch barrel action/bolt?

Who makes barrels for the Barrett aside from Barrett? I called them amd they wanted almost $1900 for a barrel.
Proof. Barrett (steel $1500-1600). And anyone else you want so long as you purchase the MRAD barrel maker’s kit with barrel extension and bolt head. My 6.5cm barrel is a PVA, 300prc and 308win are factory Barrett.
 
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