I had a Ruger Mini 14 that shot patterns instead of groups.
I also had a stainless laminated Ruger 10-22 Walmart limited edition that grouped multiple types of ammo in 5" to 6" groups at 50 yards. Totally useless if you couldn't hold on a squirrel's head at a reasonable yardage and expect to hit it. It went back to Ruger, who declared it "fine". Walmart refunded my money on that pile of dung.
I had a Kimber Stainless Target II 10 mm that wouldn't feed from the magazine with more than three rounds in it. I tried multiple different mags and springs and bullets. Another turd.