Call Freedom Arms and ask them if they still support the forcing cone bushing - I don't think they do. This is an early gun and doesn't have the replaceable firing pin (can be retrofitted for a couple hundred $ incl shipping). The firing pin's are subject to breakage. Don't know what "EXP" is unless it's express rear sight.
On the plus side the gun has an aux 45 colt cylinder (a plus to me not to others who say it isn't needed), and micarta grips.
New list price is $3,350 without the 45 colt cyl and without micarta grip upgrade.
Here's one that's similar without 45 colt cyl and no micartas for $2,100 (shipping included but transfer fees would add to the cost). It also has the forcing cone bushing and probably no replaceable forcing cone. No 45 colt cyl and no micarta grips.
Freedom Arms Model 83- .454 Casull for sale online.
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Paul