Same here
I bought one with a safety about a week ago and found the same issue. I've been operating the safety several times a day since I bought it to see if it loosens up but it hasn't.
I read somewhere that someone built up the safety tab with some JB Weld epoxy forming an extension and...
I just purchased one today and agree that the safety is way stiff. I also had to use two fingers to move it to SAFE, and can barely release the safety with my strong hand thumb. I hope it gets easier with use.