Originally Posted by Onward Allusion
The 1911 design is NOT inherently unreliable, as long as you get one that rattles and feed it only ball ammo.
Another myth that just won't go away.
Can you just imagine the line of trucks headed back to the five WW2 contractors if the US government had been told that the pistols need to be broken in with 500 rounds before they'd be reliable?
And new USGI pistols weren't rattle-trap loose when they were new.
And I have several unaltered USGI pistols dating from 1913 to 1945 that can't tell the difference between hardball...hollowpoints...and even cast 200-grain semiwadcutters...and they'll do it with the USGI "hardball" type magazines.
The 1911 pistol was designed to function. If it's built to spec, and fed halfway decent ammunition from a proper magazine...it will function. It's a machine. It doesn't have a choice.
Assuming that the frame ramp and barrel ramp is to spec, the magazine is the usual cause of feeding/RTB issues...at about 90%. Wish I had a dollar for every problem child that I've "fixed" by doing no more than handing the gun's owner a few of my magazines. They've usually been mystified to discover that their high-end "tactical" magazines were causing all their headaches.
For intermittent return to battery problems...look first at the extractor. That's where the bug usually is...again at about 90%.
And there's more to the extractor than tension alone. If everything is to spec...including the extractor...you can set the tension and drop it in. If not...then it's gonna need some attention.
If the pistol hangs up part-way out of battery...check to see how much of the tensioning wall is showing in the breech area. About one in five pistols manufactured since Y2K have too much...called excessive deflection. With that in play, you can remove tension until the thing won't pull a case out of the chamber without solving your RTB problem. And you can bevel the lower edge until it won't hold a case long enough to snack the ejector...with the same results. In fact...more recently...excessive extractor deflection is just about tied with the magazine for being at the root of all RTB problems.
The picture below illustrates excessive deflection. Here, there's about twice as much extractor in the breech than there should be.
It shows evidence of "tuning" without resolving the problem. It took all of five minutes to resolve, using a safe-sided rail file and a dial caliper.