H&R 732 metal vs plastic mainspring head

I have heard that the plastic head of the mainspring bar will disintegrate over time so I have a metal head bar on the way from Numrich.
Is there a big difference in trigger feel between the two heads? Was the nylon head used only as a cost saving measure?
Thanks,
John

Is there a big difference in trigger feel between the two heads? Was the nylon head used only as a cost saving measure?
Thanks,
John
