Glock 19 vs 19X vs 45: frame size, slide length and parts
The Glock 19X and the Glock 45 look like a 19 from the top and a 17 from the side, because that is what they are: a 19-length slide and barrel on a 17-length frame. They exist because the military pistol trials asked for a full grip with a short slide, and civilian buyers liked the idea. This guide compares the three, in numbers and in use, and lists the parts they share.
The numbers
- Glock 19 Gen 5: 4.02 inch barrel, about 7.36 inches long, about 5.04 inches tall, 15-round magazine, roughly 23.6 ounces without a magazine by Glock's figures.
- Glock 19X: 4.02 inch barrel, about 7.44 inches long, about 5.47 inches tall, 17-round magazine, roughly 24.8 ounces. Coyote color, lanyard loop, no front serrations, ships with one 17 and two 19-round magazines.
- Glock 45: same barrel and length as the 19X, same 17-round magazine, black, front slide serrations, flared magazine well, no lanyard loop.
Width is the same 1.26 inches on all three. Figures are Glock's published specifications; check the product page for the pistol you are buying.
What the full-size frame changes
The 17-length grip adds about half an inch of height and two rounds of capacity. Every finger fits, which helps control for shooters with large hands and helps everyone in recoil, and the 17-round magazine is the most common Glock magazine there is. The cost is concealment: the grip is what prints, not the slide, so a 19X or 45 hides like a 17, not like a 19. For a home or duty pistol the trade is good; for appendix carry under a t-shirt the 19 wins.
What the short slide changes
A 19-length slide on a 17 frame gives up nearly half an inch of sight radius and a little velocity compared with a 17, and gains a pistol that clears a holster faster and points quickly. The recoil impulse is a touch snappier than a 17 and a touch softer than a 19, because the frame is heavier and the slide lighter. In practice most shooters cannot tell a 45 from a 17 on a timer at typical distances.
19X versus 45
The 19X is the closer copy of the military trials pistol: coyote finish on frame and slide, a lanyard loop at the base of the grip, a magazine well without a flare and no front serrations. The 45 is the civilian and police version Glock released a year later: black, front serrations, a flared magazine well and no lanyard loop. Mechanically they are the same pistol and take the same parts. Pick by color and by whether you want the loop.
Magazines
The 19X and 45 take every Glock 17 magazine: 17, 19, 24 and 33 rounds, and the 10-round restricted version. They do not take Glock 19 magazines, which are too short to lock into the full-size frame. A Glock 19 takes its own 15-round magazine and every longer 9mm Glock magazine, protruding below the grip. The 19-round magazine that ships with the 19X is a 17 body with a taller floorplate. Details in Glock 19 magazines.
Parts they share
All three are Gen 5 pistols, so the slide, barrel, recoil assembly, extractor, firing pin, firing pin safety, slide stop, trigger bar, trigger housing, connector and sights are shared with a Gen 5 19. A 19 Gen 5 slide fits a 19X or 45 frame, and the reverse. Frames, magazine catches and backstraps are full-size parts shared with the 17 Gen 5, and the 19X frame differs only in color and the loop. Holsters molded for a 19 Gen 5 usually take a 19X or 45 if they are open at the top of the grip, since the slide is identical, but check with the maker. The Glock 47, sold from 2023, goes the other way: a full-size frame with a slide built so a 19 Gen 5 slide fits its frame as well.
Holsters
Because the slide and barrel are identical, a holster cut for a Gen 5 19 that is open at the top usually takes a 19X or 45; the grip simply stands taller above it. Retention holsters that lock on the ejection port work across all three. Light-bearing holsters key on the light and fit any of them with the same light. Magazine pouches differ: a 19 pouch is too short for the 17-round magazines the crossovers use, so buy pouches for the magazine, not the pistol.
Shooting the three
On a timer, the 45 and 19X shoot like a 17 with a fraction less sight radius: the full grip gives the support hand more to hold, and the heavier frame damps recoil a little. The 19 gives up a finger of grip for shooters with large hands and is the easiest of the three to conceal. If you can, shoot a 19 and a 45 side by side before buying; most people find the difference in the hand larger than the difference on paper.
Which to buy
- Everyday concealed carry: Glock 19.
- Home, duty, range, open carry: Glock 45, or a 19X if you prefer the color and the loop.
- One pistol for both: Glock 19, with a 17-round spare magazine for the nightstand.
- Already own a 19 Gen 5: its slide and barrel move to a 45 frame, if you want to try the full grip without buying a whole pistol.
Read Gen 3 vs Gen 4 vs Gen 5 for the older 19s, set up a carry 19 with the carry guide, and browse Glock 19, 19X and 45 listings. Pistols ship to your FFL dealer; parts ship to your door.
General information, not legal advice. Current as of September 2026. Laws change; check the official source before you act.
