My first thought is check the magazines, with most problems on a 1911. Since the only thing changing on the gun is the spring tension of the follower between rounds and it happening at the same point. Maybe the feed lips are dorked up and by the third round it can tilt up and interfere with the casing coming back. It's either that or the extractor or a combination there of. Dont know what else would cause it to do that at the same point every time.
Magazines are disposable accessories that wear out and should be replaced from time to time. But if magazine is not an issue insure that there is a gap between feed ramp and barrel as shown above, if not there will be feed issues because bullet will hit top of barrel and slide will catch it creating jams.
I would add that the "jump", and the space shown as 1/32 inch, is necessary. It is detrimental for the two ramps to become one continuous one without the jump. There must be a jump from the frame ramp to the barrel ramp or reliability of feeding will be impaired. It seem counter intuitive but it is true. A read of Jerry Kuhnhausen's 1911 service manual will reveal this requirement:
You didn't mention the bullet type, but I will assume a RN?
Wolffe Springs are miraculous. I've swapped out the springs on every single magazine I own for my 1911's and I have no issues (whereas I would occasionally have issues, particularly on the Para Ord mags.
One exception; the old girl, no sense in swapping out the springs on a Model 1911 2 tone-1916 magazine. It doesn't get used!
I wonder if something could have made its way in to the mag? I do not own a 1911......yet, but if you can disassemble the mag ya may want to check.
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