Gen 4 magazines can be used in any generation of Glock pistol, however you must use Gen 4 magazines in a Gen 4 Glock if you want to switch the gun from a right-handed magazine release to a left-handed release.
Use only Glock factory magazines. There are a number of knockoff, aftermarket magazines available on the market. Currently Glock magazines are inexpensive and plentiful. There isn’t any reason not to use the real thing.
You can use the high-capacity 33-round 9mm and 31-round .40 S&W magazines in full-size (Glock 17 & 22) and compact-size (Glock 19 & 23), however these magazines may or may not be reliable in the sub-compact frame (Glock 26 & 27) pistols.
You can use any caliber appropriate magazine in any smaller version Glock than what the magazine was originally intended for (with the exception of the new single-stack Glock 43). Example: In a subcompact Glock 26 you can shoot larger Glock 19 or 17 magazines. A compact Glock 19 can use magazines from a full-size Glock 17.
If you add a magazine extension intended to add two rounds to 9mm magazines or one round to a .40 S&W magazines, you will not have to change springs in subcompact magazines (Glock 26 & 27), you will need to use a spring intended for 17-rounds with compact size magazines (Glock 19 & 23), and if you want to add the extension to full-size magazines (Glock 17 & 23) you can order directly from Glock a spring that is intended to push 19-rounds. Only use genuine Glock parts, including the extension.
If you don’t have the patience for a detailed explanation, then you will still be well served by the information above. If you want to know more, keep reading.
Glock or M&P?
Some of you are Glock owners and some of you own Smith & Wesson M&P series pistols. A couple of members are about to make their first handgun purchase and have asked my opinion as to which they should buy. I’m a Glock guy, but only because I owned Glocks before the M&P line of handguns was introduced. If for some reason all of my Glocks were to disappear (fire, tornado, etc.) and I had an insurance check to replace them, I’m not sure which I would buy. Both are fantastic pistols that are used by law enforcement and military all over the world. These are some great YouTube videos comparing the Glock and the Smith & Wesson M&P series of handguns. All of the videos compare the full size models, except for the last video that compares the compact version of each type. The following videos compare the two types of handguns. For individual reviews be sure to visit Savannah Arsenal’s Semi-Automatic Handgun page.
If you have carried a handgun for any significant portion of you life, then you probably have the ubiquitous shoebox in the closet full of holsters that you spent hard-earned money for, used for short time, and then vanquished to the shoebox.
After years of carrying I have found that a good pocket holster for my J-frame S&W .38 special, and in-the-waistband (IWB) holsters for the same J-frame and for a small or mid-size Glock will fulfill 99% of my carry needs. Occasionally I might carry a handgun outside the waistband on a belt type holster, such as when camping and hiking, but most of the time I want the deep concealment of a IWB type holster.
Several followers of this blog are shopping for IWB holsters at the same time. “J²” was generous enough to share his research into many of the IWB offerings from the major manufacturers, as well as some cottage industry companies.
Shown below are his findings, showing holster names, prices, and photos. Click on the name of the holster to take you to their website. Click on photos to enlarge.
Research by J²