ar 41's (Mauser Borsigwalde) aren't all that rare...but if the rifle was ALL matching, including bottom metal (I assume you mean trigger guard and floorplate), it could be worth $2k and up these days....
But if the trigger guard and floorplate are mismatched it isn't worth nearly that....likely around $750 to $1k would be around what you could get for it.
It is still a good collectible gun.
Don't mess it up trying to put on a fake ZF-41 on it. Number 1, they really kind of suck, only 1.5 power, and they are not sniper rifles, meant to be more a squad designated marksman type rifle. They are almost impossible to line up correctly in relation to the axis of the bore, so usually difficult to sight in, sometimes you won't even to get it on paper. And if the repro scopes have the same optical adjustment as the originals, you need three hands to adjust it....
Its fine to play around with it on an RC, but I wouldn't mess with it on a substantially matching non-RC rifle...
I have a real one...it looks cool, but not very good for practical purposes....