STxDR

Great. Thanks wallhangar, thats the info I was looking for. Much appreciated

I have purchased the Nova Police 18.5 inch barrel shotty. I bought the 2 shell mag extension form benelli and the 14 oz mercury recoil reducer and mounting bracket. I installed the mag extender with included spring and cannot get more than 4 rounds in the tube. does the spring need to be custom fit? 2nd is the recoil reducer. the mounting bracket shipped with a rubber hose inside, does that need to be trimmed to fit inside the bracket with the mercury recoil reducer in it, or what is it's purpose? Thanks in advance.