I have an as new Fulton Armory Phantom. Full free-float 20" upper with the "false" flash hider, chrome-lined, round steel knurled free-float handguard, nice flip up front sight, flat-top config on a Bushmaster A2 lower with std trapdoor stock. This rifle is deadly accurate and very well made. Have shot many sub MOA groups from a sandbag rest. I'm considering trading for an M4 flattop collapsible stock since I have other bolt action long-range rifles. What's it worth? I was thinking at least $800+ with the Armalite scope mount. This setup was at least $1000 new. Also, why so few Fulton Armory owner's here? Thanks

You might do better trading than you would selling it.  Take it to the EE and post a picture, then state what you are looking for.  The worst that happens is that it sits there for awhile.