I would have no problem letting a friend with a LTCF borrow a handgun. I'd question why they wouldn't just buy their own and I'd offer to assist them with that. If it was temporary until they researched what they wanted or until they saved up a couple more $, that would be fine to me.

If you wouldn't loan your friend one of your guns because you don't trust them - then why are you friends with them in the first place?