What is the worry in this group with universal background checks for private sales?

[DonP]

11. I've loaned my Browning BPS pump to a friend for pheasant hunting for a weekend a couple of times.

Got it back in great condition with a couple boxes of good shells and a cleaned bird as a thank you.

I teach basic pistol and concealed carry, so letting a student "borrow" a gun that fits them better is normal at the range. But with the students, I'm always right there with them.

Sometimes at the range people will let somebody try their gun. Last Summer I swapped one of my Garands with a guy next to me at the range, so I could shoot his Holland & Holland 600 Nitro Express double rifle (Elephant Gun). I'll never see one of those outside of a museum and he was a WW II vet that hadn't touched a Garand since 1945. We both had fun and walked away with big grins and a huge bruise on my shoulder from that thing.

Private sale background checks were part of the deal to get concealed carry here in Illinois. The Chicago people wanted more but they had to settle for that. 2 years later, it has made zero difference in Chicago criminal shootings, without a single declined transfer or prosecution. "Amazingly", the people doing all the shooting in Pilsen, Chatham and the other neighborhoods aren't getting the guns from law abiding people that would use any system. no matter how simple.