the Rock River Arms NM A2 is listed for $1,000.00 even at
ADCOfirearms
if your rifle can be purchased for under this amount by about $295 less than this (plus more if you need 'smithing help) to add the 'once youre serious' necessary upgrades of a float tube, NM sights and trigger then i say go for it...
i would think if its in 'like new condition' it should go for about $600. my local shop carries these for about $800 or so...
if its at that price or less, then i would have bought it before posting but i understand your questions...
sounds like it might be the way to go. shoot it for a while and if you think you want to get serious, add the extra parts. you can do a trigger and sights without much trouble at all if youve got opposable thumbs. a float tube requires a few special tools...
good luck with your choice...
david