Kind of an older re-post, but when the need arrives....these come in handy.
Never seen such a thing but boy you right .. very handy now must have.
Roll pin punches are an essential tool for me in working on vintage airguns.
I use this 6pc set from WILDE and have been more than happy.
You can get the set for $30 most places, they're a great way to dip your toes if you don't think you need a very large set.
https://wildetool.com/product/6-piece-roll-pin-spring-punch-set/
Mayhew probably also offers a 6pc or so set if you wanna dip your toes.
I think I bought several sizes of those and a bunch of cape chisels from HJ Epsteins years.
So far I have not needed any of them, but paid little for them so I have no regrets.