I have an older M21- with the single trigger- I seldom if ever switch the button to change the firing order, but before I tried to drive out that button with a dowel, I'd try some spray aerosol "de-gunking" cleaner- or even some Hoppe's- might just be crud--

I'm the third party owner of mine, my late father bought it, slightly used, in 1948- gave it to me in 1980. Standard grade 12- 28" barrels, ejectors, good luck with the trigger project.

Last edited by Run With The Fox; 02/12/19 09:37 AM.
"The field is the touchstone of the man"..