If the bolt and carrier match the rifle it can be worth 1000$ easy. I bought a sportered G43 awhile back (6 months?) for 500$, when you consider that bolt groups can bring 300$, and the carrier can possibly bring 300$ on gunbroker or ebay that gives you an idea. BCD's are harder to find as the factory was bombed out in 1944, that said I think I'd also be more leery of buying a BCD if I was going to use it as a shooter. They were made with concentration camp labor and they were subject to sabotage...blind holes not drilled all the way through on gas ports, etc. 150$ for a GCB or AYE marked mag, quite a bit more for the rarer mags.