# Glock G17 Gen 4 MOS 9mm - Modular Optics System, Reliable Performance

**Brand:** Glock
**Category:** Full Size Handguns
**Caliber:** 9mm

## Specifications

- **Caliber:** 9mm
- **Barrel Length:** 4.5"
- **Capacity:** 10 rounds
- **Finish:** Black
- **Weight:** 25.1 oz
- **Overall Length:** 8.03"
- **UPC:** 764503913457
- **SKU:** UCDSUOVdZ

## Description

The Glock G17 Gen 4 MOS is the optics-ready variant of the G17 platform. The Modular Optics System (MOS) cuts in the slide allow direct mounting of common red dot sights using included adapter plates, without milling. Otherwise it's the same full-sized 9mm pistol: polymer frame, forged steel slide, and Glock's Safe Action trigger.

### Key Specifications
- **Manufacturer**: Glock
- **Model**: G17
- **Series**: Gen 4 MOS
- **Caliber**: 9mm Luger
- **Barrel Length**: 4.5 inches
- **Capacity (Standard)**: 10 rounds
- **Weight**: 1.6 lbs (25.1 oz)
- **Frame Material**: Polymer
- **Slide Material**: Forged Steel
- **Action Type**: Double Action
- **Safety Features**: Trigger/Firing Pin/Drop Safety
- **Sights (Front)**: Fixed 1-Dot
- **Sights (Rear)**: Fixed 2-Dot

### Features

The MOS adapter system supports several popular red dot footprints. The cuts are factory-done and come with a cover plate when no optic is mounted. The grip texture is the Gen 4 pattern with interchangeable backstraps for different hand sizes. All three passive safeties are present (trigger, firing pin, and drop) with no manual thumb safety.

At 25.1 ounces and 4.5 inches of barrel, this is a full-sized pistol. The optics-ready slide adds some height when a red dot is mounted, worth considering for holster selection.

### Use Cases

- **Home defense:** Full-capacity magazine, reliable ignition, red dot option for faster target acquisition in stress situations.
- **Competitive shooting:** MOS cuts let you mount a red dot for Open or Limited Optics divisions without custom slide milling.
- **Carry:** Full-sized, so holster selection matters. The MOS cut is compatible with most purpose-built MOS holsters.

## What Customers Say

*AI-generated insights from customer reviews*

Users of the G17 Gen 4 MOS tend to discuss the MOS feature prominently. The ability to mount a red dot without paying for a custom slide milling job is consistently cited as the main reason people choose this variant over the standard G17. Finding the right optic takes some research. The adapter plate system supports several footprints, but compatibility varies, and a few owners mention the process takes more effort than expected.

Ergonomics and reliability comments are essentially the same as for the standard G17 Gen 4: the grip texture and interchangeable backstraps work well for most hand sizes, and the pistol cycles reliably through a wide range of 9mm loads. The trigger gets the usual commentary, consistent pull but heavier than many competitors, and commonly improved with a connector swap.

The aftermarket ecosystem for Glock pistols is a recurring positive. Holsters, sights, magazines, and spare parts are widely available. For the MOS specifically, dedicated MOS-compatible holsters have become common enough that carry isn't a problem.

The main criticism is that the red dot mounting system, while functional, adds height over the bore when an optic is installed. Some shooters prefer suppressor-height iron sights as co-witnesses. Price-wise, most owners feel the MOS premium over the standard G17 is reasonable given the factory optics support.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Gunbuyer Com | $579.00 |

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*Data from [GunsNation](https://gunsnation.com)*