Bendix mags
The Montana folks will send you back a good mag. If the mag has been to a shop for an IRAN recently or is a relatively new mag, an IRAN is likely worth it. If it has old parts, it gets expensive and other options become more attractive. I was looking at $850 and went with a Surefly instead. If you give the AMS folks the numbers off the nameplate, they often can tell you ballpark cost over the phone.