GLOCK® 17 vs 19: Key Differences & Parts Compatibility

The GLOCK series of handguns are, by the numbers, the most popular firearms on Earth. Of those, two models are favored far more than any others: The GLOCK® 17 and GLOCK® 19. At a glance, the G17 and G19 look nearly identical -- but there are key differences to consider. With all the aftermarket parts available for both guns, it's also important to understand parts compatibility. Let's compare.

G17 vs G19 Dimensions

The G19 is more compact than the G17. It measures approximately 0.5" shorter across the slide, and about 0.4" shorter along the grip. Check out the other dimensions below for a more detailed size comparison:

GLOCK 19 Measurements

• Overall Length: 7.28"
• Slide Length: 6.85"
• Overall Width: 1.34"
• Slide Width: 1.00"
• Height w/ Mag: 5.04"
• Line of sight: 6.02"
• Trigger Distance: 2.76"
• Weight w/ Mag: 30.16 Oz

GLOCK 17 Measurements

• Overall Length: 7.95"
• Slide Length: 7.32"
• Overall Width: 1.34"
• Slide Width: 1.00"
• Height w/ Mag: 5.47"
• Line of sight: 6.50"
• Trigger Distance: 2.76"
• Weight w/ Mag: 33.33 Oz

G17 vs G19: Common Questions

Shooters often ask which pistol's generally better, the G17 or the G19? The answer is: It depends. First, let's look at the other key differences between the two most popular GLOCKs, then we'll try to answer that question.

Q: Which model has a higher ammo capacity?

A: The GLOCK 17 has a 17-round magazine capacity, while the GLOCK 19 has a 15-round capacity. Although the G17 has a higher capacity, the G19 can accept G17 magazines -- as well as any other extended magazines you might want to run for either GLOCK.

Q: Which model has a longer barrel?

A: The G17's barrel is longer, measuring 4.48", while the G19's barrel measures exactly 4" long. The added barrel length may make the G17 more difficult to carry concealed, but in exchange, it provides slightly improved range and accuracy over its compact counterpart.

Q: Do both models use the same frame?

A: No. The G19's frame is about 0.67" shorter, though both frames use the same under-barrel attachment slot for accessories, like lights and lasers. The G19's lesser magazine capacity is also owed to the frame -- the grip is shorter, which makes it a bit easier to carry concealed.

Q: Can G17 and G19 slides be swapped?

A: Yes. The GLOCK 17 slide can be installed on the GLOCK 19 frame. This applies to factory and aftermarket GLOCK slides, and this conversion works for Gen 5, Gen 4, Gen, and Polymer80 frames (which use Gen 3 parts). 

Note that the factory G17 barrel and guide rod will not work. Instead, you will need to install a "long-slide" barrel. You will also need an extended guide rod to accompany the barrel. It's also a good idea to install a slide adapter, so there is no gap between the frame and the longer slide.

Q: What other G17 and G19 parts are interchangeable?

A: The internal components of both handguns' frames are interchangeable. That includes the trigger, trigger bar, trigger mechanism housing, slide stop, magazine catch, and the accompanying springs and pins.

Because of the differences between the two handguns' slides, it cannot be guaranteed that internal slide components -- like the slide safety, depressor plunger, and channel liner -- are interchangeable. However, slide cover plates can be swapped between the G17 and G19.