You have hit on one of my favorite gripes.
My first handgun was a Series 70 which I purchased in 1971 when I was in the Army. It had the 4-finger bushing. It was totally unreliable. Constant failure to come to battery. I practically learned to be a gun smith on that piece. I polished all metal to metal contacts, got emery cloth and polished the ramp, the inside of the slide, polished the o.d. of the barrel, "broke" the edges on the locking groves, tried different recoil springs -- everything and it still hung up.
I started having nightmares about malfunctions. Then finally I bought a simple GI bushing and it never hung up again. Boy, was I p*****. I had even called Colts and they couldn't imagine what was wrong. WHAT WERE THEY THINKING???? This firearm was stock, in no way a target piece. Reliability should have been #1.