bonny,
If you go back and ask to take the barrels off, you will see the wear points are mostly steel to steel. It will have a steel hinge pin, the steel barrel underlugs are locked with steel. While I can't verify(since I don't know)there will likely be steel bushings at the firing pins that are large enough to take the back thrust from the caseheads. Sharps 4590's Meffert, and mine are both made that way. BTY, Heym did ,I believe, produce a steel version of this model.
Mike
Last edited by Der Ami; 11/22/16 01:55 PM.