Those who carry concealed handguns should be competent in their use. Competence encompasses the whole spectrum of operation (safety, accuracy, drawing, holstering, reloading, and clearing malfunctions) which determines the effectiveness with which handguns are employed during deadly force encounters. Experienced shooters and novices are often guilty of at least one of five fairly common mistakes that compromise this scope of competence, thus limiting the effectiveness of their concealed handguns. Fortunately, these mistakes are rather simple to address.