I'd love to see the size of the guy they have put the pins in.
I've taken apart dozens of ARs from other brands without issue.
At minimum with Norinco/DA guns now, I heat it with a MAP torch first, then try it; if that doesn't work I drill out the pins.
Pins and Delta rings are very tight to ensure things do not fly apart during critical military situations. Remember these are fighting tools that need to be reliable and are just toys for us.
Question: disassemblers understand that the front sight pins are tapered right?