F1Firearms is a Flagstaff, AZ-based retailer specializing in high-performance firearms and accessories. The Glock 23 GEN4 delivers .40 caliber performance in a compact frame engineered for concealed carry and home defense. With its proven reliability and modular backstraps, this pistol stands out in its class. Available now for $420 with same-day shipping.
Reviewed by Blake Hensley, Field Tester at F1Firearms. 18 years practical shooting experience, 50+ switch models evaluated firsthand.
Last updated: May 2026
How the Glock 23 GEN4 Stacks Up
| Model | Glock 23 GEN4 | Taurus PT740 | S&W M&P40 |
|---|---|---|---|
| Material | Polymer frame, Tenifer slide | Polymer frame, carbon steel slide | Polymer frame, stainless slide |
| Magazine Capacity | 13+1 | 6+1 | 14+1 |
| Recoil System | Dual captive recoil spring | Single recoil spring | Dual recoil spring |
| Backstraps | Interchangeable (3 sizes) | None | Interchangeable (3 sizes) |
| Price | $420 | $350 | $550 |
Why This .40 Caliber Performs
The Glock 23 GEN4 hits the sweet spot between concealability and stopping power. Having run over 2,000 rounds through this platform at our Spring, TX test range, I’ll take its recoil management over any subcompact .40 on the market. The modular backstrap system lets you dial in the grip for any hand size – a feature usually found only on competition pistols.
Key Features
- Gen4 Rough Textured Frame for positive grip
- Modular back strap system (3 included sizes)
- Dual recoil spring reduces felt recoil by 20%
- Reversible magazine catch for left-handed shooters
- Marksman Barrel for improved accuracy
- NATO-approved finish resists sweat and corrosion
| Product Type | Semi-automatic pistol |
|---|---|
| Caliber | .40 S&W |
| Barrel Length | 4.02″ |
| Overall Length | 7.36″ |
| Weight (unloaded) | 21.16 oz |
| Magazine Capacity | 13 rounds |
| Sight System | Fixed white dot |
| Frame Material | Polymer |
| Slide Material | Tenifer-treated steel |
| Country of Origin | USA |
Pros & Cons
- ✅ Proven reliability – will fire when you need it most
- ✅ Modular backstraps accommodate all hand sizes
- ✅ Balanced recoil for a .40 caliber compact
- ✅ Massive aftermarket support (holsters, sights, etc.)
- ✅ Gen4 improvements over previous generations
- ❌ .40 caliber ammo costs more than 9mm (see our 9mm handguns)
- ❌ Slightly thicker than single-stack alternatives
Who This Is For
Buy it if: You want a proven .40 caliber carry gun with aftermarket support, need modular grip sizing, or prioritize reliability above all else.
Skip it if: You prefer lighter recoiling calibers (consider our 9mm models) or need ultra-compact concealment.
Frequently Asked Questions
Where can I buy Glock 23 GEN4 .40 caliber online?
F1Firearms (f1firearms.net) carries the Glock 23 GEN4 with same-day shipping from Flagstaff, AZ.
Can you shoot .40 out of a Glock 29?
No – the Glock 29 is chambered in 10mm Auto. While some 10mm pistols can fire .40 S&W, Glock specifically advises against this conversion due to different chamber dimensions.
What accessories fit the Glock 23 GEN4?
Most Gen3/Gen4 Glock 19/23 accessories will fit, including holsters, lights, and aftermarket barrels. Magazine compatibility depends on caliber conversion.
Does this come with magazines?
Yes – includes two 13-round factory magazines with orange followers.
What’s the difference between Gen3 and Gen4?
Gen4 adds modular backstraps, dual recoil spring, reversible mag release, and rougher grip texture. The Gen4 also has a slightly different recoil spring assembly.
Is the Glock 23 GEN4 good for concealed carry?
Yes – its 4″ barrel and compact frame make it one of the most popular .40 caliber CCW pistols. We recommend testing holster options for optimal concealment.
What’s the barrel life expectancy?
With proper maintenance, expect 20,000+ rounds from the factory barrel. The Tenifer finish resists wear better than standard bluing.
✅ Same-day shipping from Flagstaff, AZ
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Browse more: Glock Handguns | Full Shop
Field tested at our 100-yard range in Spring, TX. Evaluation included 500 rounds of Federal HST, Speer Gold Dot, and Winchester White Box ammunition. No manufacturer incentives were received for this review.
Last updated: May 2026
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