Marlin 1894 CB is my favorite. A Marlin 1894 in .44 Magnum will make a world of difference over the same model in a .32 H&R Magnum. Besides taking the more common ammo, the Marlin in .44 will do wonders against fast-moving zombies, allowing you to anchor the flesh-eaters with some pelvic or thigh shots.
1) S&W M&P AR15 2) M249 Squad Automatic Weapon 3) S&W M&P .40 Although I have a much longer list lol. Unfortunately don't own a M249 haha but I did carry one in Iraq. Here's a picture of my babies. M&P 15 Sport, Mossberg 500, Ruger SP101 .357, and a Glock 30 .45 ACP