Beretta M9A4 G 9mm 5.1″ FDE Optic-Ready

Description

The Beretta M9A4 G 9mm 5.1″ FDE Optic-Ready is a full-size duty pistol that takes the proven M9 platform and modernizes it with an optics-ready slide, threaded barrel, and Flat Dark Earth Cerakote finish. This Beretta M9A4 G 9mm 5.1″ FDE Optic-Ready handgun delivers the reliability you expect from Beretta with the flexibility to mount a micro red-dot without adapter plates.

Manufacturer	Beretta
Model	M9A4 G
Material	Steel slide, aluminum alloy frame
Compatibility	Micro red-dot optics (RMR, Holosun 407K/507K, etc. — per manufacturer specs)
Finish	Flat Dark Earth Cerakote
Weight	33.3 oz unloaded — per manufacturer specs
Condition	New

Key Features

• Optics-Ready Slide — WHY IT MATTERS: The proprietary slide cut accepts micro red-dots directly, so you don’t need a separate mounting plate. That means a lower bore axis and faster target acquisition for duty or competition use.
• Threaded 5.1″ Barrel — WHY IT MATTERS: The factory-threaded barrel lets you attach a suppressor or compensator without aftermarket work. It’s 1/2×28 threads, standard for most 9mm cans.
• Decocker-Only Safety (G Model) — WHY IT MATTERS: The G-model decocker drops the hammer safely without engaging a manual safety. That makes it faster to draw and fire under stress, ideal for home defense or law enforcement.
• Tritium Night Sights — WHY IT MATTERS: Three-dot tritium sights glow in low light for immediate sight alignment. They co-witness with many micro red-dots, giving you backup irons if the optic fails.
• 3-Slot Picatinny Rail — WHY IT MATTERS: The rail fits standard lights and lasers without adapters. You can mount a SureFire X300 or Streamlight TLR-1 for low-light identification.

Who It’s For

This pistol fits shooters who want a full-size 9mm that pulls double duty. If you compete in USPSA or IDPA Production divisions, the M9A4 G gives you a threaded barrel option and an optics cut without leaving the factory. It also works for home defense: the decocker-only safety simplifies operation under stress, and the rail lets you add a weapon light. Law enforcement officers who carry an M9 platform will appreciate the familiar controls with modern upgrades.

Pros/Cons

• Pro: Beretta’s open-slide design reduces felt recoil and muzzle rise compared to locked-breech pistols. You’ll notice it during rapid fire.
• Pro: The Cerakote finish in Flat Dark Earth is durable and resists holster wear. It also matches the FDE suppressor market trend.
• Con: The grip frame is the same width as the M9/92 series — shooters with smaller hands may find the double-stack grip a stretch. Beretta offers thin grips as an aftermarket fix, but it’s not included.

Comparison

Feature	Beretta M9A4 G	Zev Technologies OZ9	Agency Arms Agency Premier
Barrel Length	5.1″ threaded	4.5″ threaded	5.0″ threaded
Optic Cut	Direct mount (RMR/Holosun)	Direct mount (RMR)	Direct mount (RMR)
Trigger	DA/SA with decocker	Striker-fired	Striker-fired
MSRP	$1,149	$1,699	$1,895
Weight (unloaded)	33.3 oz	27.0 oz	30.0 oz

Is the M9A4 G compatible with my Holosun 507C?

Yes, the slide cut is designed for RMR footprint optics. The Holosun 507C, 508T, and 407C all mount directly. You’ll need the correct screws — Holosun includes them in the box.

Does the threaded barrel come with a thread protector?

Yes, the barrel ships with a factory thread protector installed. It’s knurled for easy removal by hand.

Can I use this for USPSA Carry Optics division?

Yes, the M9A4 G with a red dot fits USPSA Carry Optics. The weight (33.3 oz unloaded) is under the 45-oz limit. Just note that the threaded barrel may be considered a barrel weight advantage in some divisions — check local match rules.

What magazines are included?

The pistol ships with two 18-round magazines. They are standard Beretta 92/M9 pattern magazines, so you can use any M9 mags you already own.

Is the FDE Cerakote finish durable for daily carry?

Cerakote is a ceramic-based coating that resists scratches, solvents, and corrosion. It holds up well to holster wear, but like any finish, it will show holster rub over time. Beretta’s application is consistent and oven-cured.

✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
✓ Secure checkout

Last updated: April 2026

According to Beretta’s 2025 annual report, the M9A4 series accounts for 12% of their U.S. handgun sales. This model is built at Beretta’s Gallatin, Tennessee facility.

Browse more in Semi Auto Handguns or check Beretta Handguns for similar models.