Re: 20 ga barrels?? Archived Message Posted by Tom Martin on December 28, 2014, 3:33 pm, in reply to "20 ga barrels??" The raised rib became standard around 1939-1940 although I have a 1936 .410 with the rais583 ed rib. Message Thread: 20 ga barrels?? - danny December 28, 2014, 3:28 pm Re: 20 ga barrels?? - Tom Martin December 28, 2014, 3:33 pm Re: 20 ga barrels?? - danny December 28, 2014, 3:46 pm rib - Chris December 28, 2014, 5:46 pm Re: rib - danny December 30, 2014, 8:46 pm   Searching