We see Chirrut Imwe beat many Stormtroopers unconcious with his staff and several times pieces of armour visibly chip and shatter when struck.
Do we know exactly what Chirrut Imwe's staff is made out of?
It looks like it's wood with a possible steel grip or handle, but Chirrut hits troopers with both the steel and wooden ends so I don't think it's the grip that makes it especially powerful.