All of them, if I had to go with 1 to function and have absolutely no issue with feeding or anything it would be any of my Remington 870 Wingmasters. Other on teh list woudl include a Marlin 336, AR-15, Tikka T2 .243, Stevens 200 .223, various Marlin .22's (excluding the 60 and excluding ammo fail to fires), and I have never experienced an issue with my Beretta 391 Urika 20 gauge.
But if I had to pick on to bet mylife anytime on that it will go bang it would be my Wingmaster 12 gauge, you can sort of say we have a bond based on experience.