My favorite deer rifle is having some problems. It's a pre-64 Winchester Model 70 in .300 Win Mag, probably about 5 years old, stainless/synthetic. Last Fall the magazine cover catch (I think this is the right term) broke off, and the spring shot it across the room, leaving the magazine cover hanging. I was able to recover all the parts, but the local gunsmith is having a lot of difficulty locating a replacement part. In fact my favorite rifle has been at the gun shop since September, and he still hasn't been able to locate the right part. Can anybody tell me where a good place to start looking is, or if there is an alternative way to fix this problem? I hate to have such a great rifle ruined by a part that's smaller than a .30 cal bullet.