I have just picked up a Greener GP Martini Action shotgun. This is the take down model in very good condition with vertually no pitting in the barrel. The metal work and wood work is in good condition. Serial number is 221X. It is NP for 2 3/4" 1 1/4 oz loads. I am looking at installing a rifled choke internally for use with cast balls and fosbury style slugs. Can anyone help me to find out when this gun was made please.