The model names do not inform anyone of what the pistol is designed to be used, and that one detail alone will create more confusion in buying than any caliber arguments ever will. It is merely release order, not a secret code of position, size or chambering. When one has that figured out, selecting a proper Glock becomes less mystical and, except, more mechanical: the barrel and grip sizes define handling and concealment, the caliber controls recoil and mission, and the tiniest of configuration decisions (optics cuts, trigger parts, magazines) dictate how the gun will perform when it counts.
The product line also has decades of progressive engineering. Initial doubts of polymer frames did not stand the test of time in actual application and the minimalist design of Glock stayed in its own prototype of the design. The question today is not whether a Glock works but what footprint might best suit a particular task and not compel the shooter to make sacrifices that can be concealed with a skillful and sometimes deft hand, clothing or practice.
Begin with size, since size is the driver of all other things. In the “duty” version, full-size 9mm models like the G17 and G47 have the longest useful sight radius and tend to be more pleasant when firing, particularly with faster strings. Smaller types of pistols such as the G19 sacrifice some length and grip to carry more easily in every-day life, whereas subcompacts and slim single-stacks (or slim near-single-stacks) focus on concealment. The engineering secret behind this is that the grip is frequently the teller-tale than the slide: the longer the grip, the greater the chances of it to pierce the garment when the owner is ordinarily moving. The reason is that discussions on concealment continue to go round and round around the issue of grip length rather than barrel length.
The barrel length is still relevant, but not as people debate about it in the internet. With iron sights, longer slides may be easier to shoot and velocity may vary between shorter and longer tubes based on load. The current trends in carry feature shorter barrels as they fit better but full-size barrels are still used in duty and training. The scope of the practical division is summed up in the larger discourse of the influence of barrel length on velocity, recoil, and concealment, making the trade appear to be concerned with ergonomics of performance instead of the myths of short being short.
Then comes caliber. The reason behind the 9mm family of Glock winning the battle is as follows: it has controllable recoil, a high magazine capacity, and a broad selection of ammunition. It also cleans well to size, down to carry-size slim models as well as full-size duty guns. Move to heavier options and the use cases become smaller. A smaller compact, such as the G30 SF, has a stronger impulse in a shorter frame, whereas 10mm Auto is the outlier that has been selected in tasks that require deeper penetration and more energy, such as backcountry carry and hunting-oriented loads.
The picture is further changed with optics-ready slides and modularity. With a full-size cut with factory optics, a red-dotted set-up can be built with no custom milling, and the more modular combinations offered by Glock allow some shooters to share their configuration across slides and frames. That modular concept is one of the reasons why the G47 is of interest in the current line: it can accommodate “big gun” handling but also accommodate other slide configurations such as compact-length slides to those who have decided on a single operating system.
The concealed-carry item is not an issue of locating a magic model, as much as it is a control over printing and access. An inch of slide can be insignificant compared to a stable inside-the-waistband fit, the correct ride height and even the choice of clothing. This is the fundamental physics of the so-called concealed-carry printing avoidance, which is a matter of holster geometry, body positioning and clothing behavior upon bending, reaching, or sitting. That fact is the reason why it may be “easy” to live with a G43X day by day whereas a full-size pistol may need a wardrobe and a system of belts to take it as its own.
It omits one detail that is not as noticeable as slide length trigger changes. People usually seek feel but the reliability line will become real when internal components begin to be swapped. According to one of the long-term Glock owners, I have been a Glock Shooter more than 20 years long… and… Not once, I never even thought of changing any of my Internal parts! The safer method of defensive guns was condensed by another more practiced user: When it comes to something that I will carry on my person, or use at home, I will not change anything besides the shoe itself. These observations are part of a general rule of training and the management of triggers can in most instances yield larger profits than parts assembly, and minor, reversible modifications involve less risk than fire-control overhauls.
The line up is completed by competition and training. The longer-slide 9mm such as the G34 MOS is inclined to a longer sight radius and optics compatibility to shoot faster and more accurately, the G44 (.22 LR) resembles the size of the G19 in general. These models retain the same control layout and logic of operation and customize recoil, sighting systems, and handling to various performance envelopes in an engineering capacity.
The end result is that picking the correct Glock is picking the amount of compromises that will be implemented day to day and the compromises that will be handled on the range.
