It’s not easy.
The cmp tag said 3+, my gauge says 2.75
I'd say your target is "Exhibit A" for why you shouldn't assume a barrel is trash just based on the gauge reading. Granted, there's a higher likelihood it's out or on the way out, but it could be a good shooter too. I've got to get mine boresighted and zeroed still. Just snagged an M2 flash hider for mine.