A guy at work want to sell a Randal Service Model .45. It has been fired on and off for a few years, but has not had a large number of rounds through it. It comes with one original mag and a couple of McCormick 10 rounders. He does not have the original grips, the weapon has Colt rubber grips on it. Is this a good buy for $500? What is the reputation of these pistols for reliability as a carry gun?