Paperboi stopped selling the moment the Rap money began to start rolling in. And if you speaking on him searching for a new plug, it wasn't to get bundles of weed to sell, but someone to hook him up to smoke. You always have that one so-called trusted plug to buy weed from. And yes, the gun thing was a problem. It wasn't about carrying it because Earn was on probation too. You have to understand the Alfred transformed into Paperboi after his crossroads revelation at the woods. He's not taking the rap game seriously and doesn't want anymore hiccups.
he most certainly wasn't just trying to cop weed to sell. in the episode where he gets robbed in the beginning, he is specifically trying to re-up. he even tells the guy how he was smoking that lemon shyt himself. and how everyone loved that bud. he also asks for Molly from him and the guy who takes his picture. the guy who adds him to the group text tells him he can get anything.
honestly I feel like that was some obvious shyt in the show. he was most certainly still selling drugs right there, no question about that.
as far as the gun, earn was not strapped. in s1e1 he takes the gun out of the glove box because earn makes bad decisions.
also, for my Georgia brehs in here, pretty sure guns in the car is the same as guns in your house. I could be wrong though cause im in NYC and our gun laws are draconian