Probably many topics on the subject but would like some newer input regarding 12g home defense shot guns. I have spent months researching and am overwhelmed by the sheer number of the supposedly reliable choice's. I have finally narrowed it down to the ..Benelli m2 vs m4,whats the difference besides inertia and gas systems and any other factors that separate the 2 models? DP12..is it really that good? Mossberg 590 and 930 tactical(tried and proven systems but mixed reviews?)(Remington Marine
Defender). I'm looking for semi auto no fail system, but will settle for a pump if its more reliable.