Uber-tight upper:lower fit, how to loosen?
I have a Baer upper I want to use for a project. Since it's a Baer product, they of course have clung to their ridiculous "tight makes right" philosophy and I can barely get this upper onto a lower without a hammer, and taking it apart damn near requires a hydraulic press.
So, this begs the question, best way to loosen the fit? I'm obviously not a big tightness nut, but I also don't want it to get so sloppy that it induces feeding issues or rattles around like a cheap Pinto going over rumble strips. I want the pins hand-operable but not much beyond that.
What's the best way to go about this?