June 20, 2013May 8, 2013 To keep your CZ semi-auto shotgun running well, some maintenance is needed on the gas system to rid it of carbon buildup. Share this gun video:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Tumblr (Opens in new window)