I don't really consider a common malfunction as the same as a failure, a failure to me would be a key breaking or a firing pin, or an extractor, something related to the mechanical components. Something like a common malfunction, double feed etc. may not even be related to the rifle per se or related to routine maintenance like extractor springs, one you can just clear and move on but the other you have a gun down. With the basic training rifles that get used among thousands of Privates and thousands of rounds any issues were typically related to the old aluminum magazines or weak extractor springs.Any failure at all.
I want to know which rifle brands have 0 failures and run thousands of rounds, or at least hundreds without any kind of failures.
Now if it's ammo related, and the ammunition is bad then we'll give a pass on the failure.