I have an older A5, according to the serial # its a 59'.. Belonged to my grandfather and I wouldn't change a thing, perfect like it is.
With the abundance of tactical and SD weapons out there now driven by the idea of a zombie outbreak, IMO it would be blasphemy to modify a clean A5.. Just my opinion.. Mine has the poly choke and several have tried to sell me on a new barrel.. They're selling, I'm not buying.