The mount is included with the sling. Watch the video at 01:47 you can see the mount in the plastic bag. No need to take it off unless you just want to. The sling swivel appears to go on like a standard Uncle Mike swivel. I would just remove sling and swivel and let the mount installed. Removing the mount frequently might cause it not fit properly.
With the Alaskan being a take down which requires unscrewing the mag tube, the front sling mount would have to come off, or be loosened in order to turn the tube. Probably not a good option for this one but I do like the looks of the setup.
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