Stag makes some left-handed models. They eject out the left side. The lowers are not any different from standard. You could add an ambidextrous safety & BAD lever if those would help.
No need. As a left handed shooter, I use right handed AR-15’s. The only concession I make is to install an ambidextrous safety so I can run it with my thumb. It all clicked for me when I started using this rule:
“The left hand runs the left side of the gun and the right hand runs the right side of the gun.”
When I was in the Army we had deflectors that attached to the eject port. Kept from getting casings down your neck. Don’t know if they are commercially available.
As mentioned, a left handed gun and/or lower is not needed. Just buy a standard AR and add an Ambi Safety, Geissele Bolt Catch, and Norgon magazine release.
Left handed AR's are a special animal and have proprietary parts. Can't use regular AR barrels either, they need to be left handed.