...As I said and I stand by it the wobble is a personal issue with me. I have a rifle built on an INGO lower that rattles like my 1942 Colt 1911.....
But rattle and all it runs hard.
I'm not a fan of the rattle either but it's much better than a friends build that I helped put together.
I think it was his first firearm and her bought one of the magnesium lowers made by the company that went out of business. With the front pin in place the upper would not close all the way due to hitting the lower close to the front pin (lower out of spec). I tried to talk him into returning it but he wanted it built that evening. I did the only thing I could and took a file to the mating surface of the lower until it would close. It still had a bit of spring to it. I bet he hasn't fired it since that first range trip several years ago. I always figured the lower would break at the forward pin holes if it was ran hard.