The paintball gun from S6 Ep12 that Ari uses is mounted to his office wall.
According to the article Airborne with Avión in The Resident, Avión Tequila hit the market in 2010. Series Creator Doug Ellin was a friend of Ken Austin who is founder and chairman for Tequila Avión. Avión was written into the script to help drive Turtle's storyline.
Despite what Alex said, in Mexico nobody carries a gun outside of criminals. All handguns are illegal in Mexico.