The M16A2 (and AR15A2) rifles have a brass deflector build into the upper receiver that does a good job of blocking the shells from hitting you lefties. I have a left-handed friend who borrowed my rifle and never complained. (It is that hump behind the ejection port.)
If this was your main concern, a stock AR15 with an A2 upper will fit your needs and be easy to find. Any gun store (not sporting goods store) will carry ARs. You should even be able to find a post-post ban by now or maybe make a deal on a post-ban w/o the bayo lug and flash supressor.
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