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You can use any barrel you wish, it will just need to be profiled, chambered and finished by a competent gunsmith, pretty much like most bolt action rifles.
I have a RZR Gen II on my CTR and cheek weld is fine, your face might be different from mine so you should always expect to make some adjustments to the cheek piece, scope mounts and rings. I added a 1/16″ cheek eeze to give it more grip and a little more height. Cheek weld can be adjusted pretty easily with some tape and fabric.
