The barrels are the same shank size. The 110 S was a first generation short action that uses long action bolt heads. Unfortunately, .223 long action bolt heads are no longer available, so one must use a short action bolt head and drill out the firing pin hole to fit. It is also necessary to use an extended firing pin stop nut to correctly set the firing pin protrusion.
The Fred Sled will not work with that magazine, it is for DBM's. You will need a Score -Hi single shot follower.
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