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I think you should really rethink how you're going to run this setup.
First of all, how do you plan on using the two rifles: will you be using the SCAR as your primary weapon while on the move and only going to the bolt action when in a position to snipe? Or do you plan on using the bolt action as your primary weapon, keeping the SCAR as a backup if things get hairy?
Also what kind of setup will you have? (vest? ghillie? carrying a lot of mags or just a hicap?)
The problem with the scabbard or that backpack is you aren't going to get to your weapon quickly. And that single point CQB sling isn't going to secure the weapon properly, leaving it flopping around to slam into you and snap on everything around you.
I think you should steer clear of the gimmicky stuff and get some serious slings, such as the Vickers Combat Application Sling.
If you're using the SCAR as a primary, you should use a drag back as Kokanee suggested. Then just remove the backpack and set up with the bolt action when you need to.
Otherwise a good sling will keep the carbine secure against you while still allowing you to transition to it with relative ease.
I've run a primary and secondary weapon (SAM-R/fullsize M16 and a tactical shotgun with a Vltor Modstock) and you have to be set up properly for it to work, otherwise you're just fumbling around trying to get to your weapon, trying to get another weapon out of the way, trying to keep them secure, etc.
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