You'd be hard pressed to find a more loyal barkeep than Mac.
Mac is a loyal employee of Robbie James and keeps bar at the Tailgate Casino in the town of Dennison. The barkeep doesn't take much guff. Mac keeps a shotgun close at hand if things get rough, and he once pointed it at a tall, dark-haired cowboy when he pushed his way into Robbie's bedroom by force. He is quite willing to toss out tipsy cowboys who show a lack of manners.
During a shootout in the Tailgate between hired toughs and the cowboy, Mac was able to sneak up behind one of the gunslingers and bash him over the head with a bottle, bringing the fight to an end.
Mac was given the opportunity to buy the Tailgate, which he quickly took advantage of.