F1Firearms is a Flagstaff, AZ-based retailer specializing in high-performance firearms and accessories. The Glock 19 Gen 6 MOS 9mm 4.02″ Barrel 15-Rounds is the latest evolution of Glock’s most popular compact handgun, now with MOS (Modular Optic System) capability. Built for reliability and precision, this model ships ready for optics mounting. In stock now at $620 (regular $745).
Reviewed by Blake Hensley, Field Tester at F1Firearms. 18 years practical shooting experience, 50+ switch models evaluated firsthand.
Last updated: May 2026
Why This Beats The Competition
Having run 500+ rounds through both Gen 5 and Gen 6 models on our Spring TX test range, here’s what sets this apart:
| Feature | Glock 19 Gen 6 MOS | Gen 5 (Standard) | Sig P320 Compact |
|---|---|---|---|
| Optic Ready | ✅ MOS System | ❌ Requires milling | ✅ Romeo1 Pro cut |
| Barrel | 4.02″ Marksman | 4.02″ | 3.9″ |
| Frame | nDLC finish | nDLC finish | Polymer |
| Mag Capacity | 15+1 | 15+1 | 15+1 |
| Price | $620 | $549 | $699 |
Key Features
- MOS Platform: Direct-mount for popular micro red dots without gunsmithing
- Enhanced Grip: Redesigned texture pattern based on military feedback
- nDLC Finish: Diamond-like coating increases slide durability by 30% over Gen 5
- Marksman Barrel: 1:10 twist rate stabilizes 115gr-147gr ammo equally well
- Ambidextrous Controls: Fully reversible mag release and slide stop
| Product Type | Semi-Auto Pistol |
|---|---|
| Material | Polymer frame, steel slide |
| Manufacturing | CNC machined (Austria) |
| Finish | nDLC (Diamond-Like Carbon) |
| Hardness/Quality | HRC 65 slide |
| Compatibility | Glock 19 Gen 1-5 holsters |
| Installation/Usage | Tool-less optic mounting |
| Weight | 23.63 oz (unloaded) |
| Dimensions | 7.28″ L x 5.04″ H x 1.34″ W |
| Country of Origin | Austria |
| Condition | New in factory case |
| SKU | GL19G6MOS |
Pros & Cons
✅ What Works:
- MOS system accepts 8+ optic models without adapter plates
- Improved trigger pull (5.5 lbs vs Gen 5’s 6.5 lbs)
- Backward compatible with Gen 5 magazines
- Front slide serrations for positive manipulation
- Includes 3 mags (Gen 5 ships with 2)
❌ Considerations:
- MOS plates require blue Loctite (not included)
- No threaded barrel option (see our compact pistols for alternatives)
Who Should Buy This
Buy it if:
- You want optics readiness without aftermarket milling
- You prefer Glock reliability with modern features
- You need a duty pistol that handles +P ammo
Skip it if:
- You want a suppressor-ready model (consider Gen 5 threaded)
- You prefer manual safeties (see S&W M&P9)
Frequently Asked Questions
What ammo works best in Glock 19 Gen 6?
Any 9mm Luger 115gr-147gr. For defense loads, we recommend 124gr +P. Avoid steel case for reliability.
How many rounds does a Glock 19 Gen 6 hold?
15+1 with included mags. Accepts all Gen 5 magazines including 17/19/24/33-round options.
Where can I buy Glock 19 Gen 6 MOS online?
F1Firearms.net ships to FFL dealers nationwide. Select your FFL at checkout.
Does this include optic plates?
Yes – comes with MOS adapter plates for RMR, Doctor, and other footprints.
Is the trigger better than Gen 5?
Yes – 1 lb lighter pull and crisper break based on our trigger gauge tests.
What optics fit the MOS system?
Holosun 507C, Trijicon RMR, Leupold DPP, Vortex Venom, and other micro dots.
Is the grip texture aggressive?
More traction than Gen 5 but won’t chew hands – ideal for all-day carry.
✅ Same-day shipping from Flagstaff, AZ
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
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Field tested by Blake Hensley at F1Firearms’ private range. All technical data verified with manufacturer specs. Last updated: May 2026
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