Welcome to the forum. The older rifles are really sweet guns, but can be a pain to find parts for. The internet is going to be your best friend on that one. As for the FTFs, if the strikes look normal, it is most likely the ammo, so I wouldn't worry about that at this point. As for the internal mag, you might be able to adjust the lips to compensate for wear. Hopefully someone on the forum will know of a source for the extractor for you.