Re: Brand New Mossberg 930 Owner we have a problem Well I installed the new nordic 2shot extension with the 3/4 cap.Was able to fit 7 rounds in tube but gun would not cycle proper. I took the gun apart only to find terrible marks on the magazine tube. I called mossberg yesturday spoke to a really nice customer service rep (david) who emailed me a pre-paid shipping label to have mossberg look at my shotgun regarding the marks on tube. Was advised will have to replace magazine tube,piston and coil spring. Sent out friday should have back in few a weeks.. I am still waiting on my replacement magazine spring that I requested on 8/13 still not sure when I will get. Will keep you posted.