I owned a Mini-14 that is 100% reliable with the factory 5 round mag. The cheap aftermarket junk that I bought was just that and jammed about every 3rd round.
My wife's first AR would jam on the last round of any magazine for about the first 200 rounds. Then the problem just quit. Now we have several ARs and no mini.
The Mini (Stainless Ranch rifle) was almost minute of coke can accurate at 50 yards. Almost, because in about 25 rounds at 50 yards I got one hit. Tried to put on a cheap 4X scope to see if it would help, nothing. The gun was minute of pie plate at 100 yards. Gave the gun away to my dad. Once he took it to the range he commented that it was total garbage after the first shot and that he had more faith in the 10/22 my mom "borrowed" from me. By the way, I shoot roughly 1" -1.5" groups at 50 yards with an AR.
So now, of the other ARs, from various manufactures including two Frankenguns, all have 100% reliable with good mags. Only stopages to date were a batch of .223 reloads I did in a very tight .223 chamber.
For the money, I really hoped the mini would have worked out, but it was obviously not what I was looking for. Don't understand where Ruger went wrong on the one, I like most of their other products.