Description
The DeSantis Quantico Undercover is a self-locking outside-the-waistband Kydex holster made for Glock owners who want serious retention without giving up a clean draw. This left-hand model drops in a Glock 17, 17 Gen 5, 19, 19 Gen 5, 19X, 22, 23, 31, 32, or 45 and is built to clear a mounted red dot. It also holds the pistol securely whether or not you've got a Streamlight TLR-7, TLR-7A, or similar-sized light riding the rail, so you're not forced into a light-only setup.
How the Quantico Undercover Locks Up
The heart of this holster is a patent-pending lock that seats inside the ejection port and stays engaged until you press the concealed thumb release. That active lock pairs with the passive retention of the molded Kydex shell, giving you a Level II hold that's the standard for plain-clothes officers, off-duty carry, and security work where you want maximum retention but still need speed. The release is tucked out of sight, so it does its job without broadcasting itself to anyone nearby. DeSantis also put the lock through strength testing, and it cleared every standard they threw at it.
Dialing In the Quantico Undercover
Tension is user-adjustable, so you can tune how tight the pistol sits to your own preference. The holster ships with 1 3/4 inch belt loops that work great on a duty belt or a solid gun belt, and those loops can be nudged for a bit of height and cant adjustment to get the ride and angle where you want it. If you run a slimmer belt, DeSantis offers 1 1/2 inch loops separately. The all-Kydex build means it shrugs off sweat and holds its shape over years of daily wear.
Between the ejection port lock, the adjustable tension, and the red dot clearance, this is a holster aimed at folks who carry a full-size or compact Glock hard and want it to stay put no matter what. It's hand-built in the USA by DeSantis Gunhide, a family-owned shop that's been making holsters for law enforcement, military, and everyday carry for over fifty years.
Key Specifications
- Manufacturer: DeSantis
- Model: Quantico Undercover
- Manufacturer Part Number: 218KB6VZ0
- UPC: 792695379393
- Hand: Left Hand
- Holster Type: Outside the Waistband (OWB)
- Material: Kydex
- Color: Black
- Retention Level: Level II, self-locking ejection port lock
- Fits: Glock 17, 17 Gen 5, 19, 19 Gen 5, 19X, 22, 23, 31, 32, 45
- Red Dot: Compatible with mounted red dot sights
- Light Compatibility: Streamlight TLR-7, TLR-7A and similar-sized lights (with or without light)
- Belt Loops: 1 3/4 inch, adjustable for height and cant
- Tension: User adjustable
- Country of Origin: USA
What’s Included
- DeSantis Quantico Undercover OWB holster
- 1 3/4 inch belt loops (installed)
Frequently Asked Questions
Will the Quantico Undercover work if I don't run a weapon light?
Yes. The holster is designed to self-secure with or without a light mounted, so you can carry a bare Glock or one with a Streamlight TLR-7 or TLR-7A attached. The ejection port lock engages either way, so you're not locked into a light-only configuration.
Does this holster clear a red dot sight?
It does. The Quantico Undercover is built to accommodate Glocks running a mounted red dot, so your optic sits clear with no interference. Just make sure your dot is a standard footprint sized to the cut on your slide.
How does the retention release work on the Quantico Undercover?
A patent-pending lock seats inside the ejection port of your Glock and stays engaged until you apply pressure to the concealed thumb release. That active lock combines with the passive grip of the molded Kydex shell for a Level II hold. It's intuitive enough to clear on a single consistent draw stroke once you've run it a few times.
What belt size does this holster fit?
It ships with 1 3/4 inch belt loops, which are sized for a duty belt or a sturdy gun belt. Those loops can also be adjusted slightly for height and cant to fine-tune your ride and angle. If you run a 1 1/2 inch belt, DeSantis offers narrower loops separately.





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