The 22" barreled Krag I bought a month or so ago won't feed.  I can only get four rounds into the magazine and they just sit there.  I shoot it by single loading--have to make sure the bolt is fully rearward and the cartridge rim is engaged by the extractor.  The gun shoots well and I really have no need for its repeating capability but it would nice if it would feed.  Does this sound like an (economically) fixable problem?