With the proverbial explosion of shall-issue concealed carry across the majority of the united states, the market for subcompact handguns has become filled with a myriad of selections for the public to choose from. Each model is different in its own right, but a significant number of them are similar in terms of size, weight, overall dimensions, caliber, and magazine capacity. Largely it comes down to personal choice on the part of the person seeking to carry them. However the matter is complicated by the existence of reliable subcompact nine millimeter semi-automatic pistols. Some differ from the smaller caliber firearms by only a matter of millimeters and ounces, or even percentages of ounces. Thus leaving one to question why do the smaller caliber firearms continue to exist and maintain such popularity, if the differences between them and the larger caliber options appear to be so minute. Is a five millimeter difference in overall length and/or width, or two ounces difference in weight, truly so significant?