# Orthos Arms Raider S4 12 Gauge 18.5in FDE

**Brand:** Orthos Arms
**Category:** Semi-Automatic Shotguns
**Caliber:** 12 Gauge

## Specifications

- **Caliber:** 12 Gauge
- **Barrel Length:** 18.5"
- **UPC:** 850039520594
- **SKU:** UCExr5CSI

## Description

The Orthos Arms Raider S4 is a semi-automatic shotgun chambered in 12 gauge with an 18.5-inch barrel and a 3-inch chamber. It has a 6+1 round capacity, an M-LOK compatible handguard, and a Flat Dark Earth stock and finish throughout.

### Key Specifications
- **Brand**: Orthos Arms
- **Model**: Raider S4
- **Caliber**: 12 Gauge
- **Action**: Semi Auto
- **Capacity**: 6+1 rounds
- **Barrel Length**: 18.5 in
- **Color/Finish**: FDE (Flat Dark Earth)

### Detailed Features
- 18.5-inch barrel with 3-inch chamber
- 6+1 round capacity
- M-LOK handguard
- Flat Dark Earth stock and furniture
- Tactical semi-auto configuration

## Frequently Asked Questions

**Q: What caliber is the Orthos Arms Raider S4?**

A: The Raider S4 is chambered in 12 Gauge with a 3-inch chamber.

**Q: Who makes the Raider S4?**

A: Orthos Arms makes the Raider S4.

**Q: What type of firearm is the Raider S4?**

A: The Raider S4 is a semi-automatic shotgun.

**Q: What is the barrel length of the Orthos Arms Raider S4?**

A: The Raider S4 has an 18.5-inch barrel.

**Q: How many rounds does the Raider S4 hold?**

A: It has a 6+1 round capacity.

**Q: Does the Raider S4 have an M-LOK handguard?**

A: Yes, the Raider S4 has an M-LOK compatible handguard.

**Q: What finish does the Orthos Arms Raider S4 come in?**

A: It has a Flat Dark Earth finish throughout.

**Q: Where can I buy the Orthos Arms Raider S4?**

A: Compare current vendor offers on this page.

## What Reviewers Say

*Quoted verbatim from YouTube reviews. Each link opens the video at the moment quoted.*

> This thing shot very smoothly. It's a lot softer shooting than I anticipated.
>
> — [Tactical Toolbox](https://www.youtube.com/watch?v=Avhcqtrjbxs&t=1004s)

> With the recoil impulse on the Orthos, it felt incredibly soft shooting and honestly, I think a lot of it had to do with the porting.
>
> — [Tactical Toolbox](https://www.youtube.com/watch?v=Avhcqtrjbxs&t=1189s)

> Note that I had zero malfunctions with this throughout those 39 rounds.
>
> — [Tactical Toolbox](https://www.youtube.com/watch?v=Avhcqtrjbxs&t=1257s)

> This one was so much more enjoyable to shoot that I found myself not wanting to shoot this one as often as I shot this one.
>
> — [Tactical Toolbox](https://www.youtube.com/watch?v=Avhcqtrjbxs&t=1270s)

## What Customers Say

*AI-generated insights from customer reviews*

Owners drawn to the Raider S4 typically want a home-defense or duty-style shotgun in a non-standard color. The FDE finish and M-LOK handguard give it a modern tactical look, and the 18.5-inch barrel keeps it maneuverable. Initial reliability reports on the semi-auto action are generally positive with standard 2.75-inch and 3-inch loads, though some owners recommend running a break-in round count before relying on it.

The 6+1 capacity is seen as adequate for its intended role, and the M-LOK rail positions allow for lights or foregrips without a separate adapter. Ergonomics are described as comfortable by most owners, though the Flat Dark Earth stock dimensions do not adjust, which can be a fit issue for shooters at the taller or shorter ends of the range.

Orthos Arms is a smaller brand and aftermarket support is limited compared to the major names in semi-auto shotguns. Buyers report reasonable value for the price, but those with a specific accessory upgrade path in mind may find sourcing parts less straightforward. Customer service feedback is mixed and mostly anecdotal at this stage.

## Pricing

**3 offers available**

| Vendor | Price |
|--------|-------|
| Buds Gun Shop | $1259.99 |
| Kygunco Com | $1282.99 |
| Guns Com | $1449.99 |

## Similar Products

- [Orthos Arms Raider S4 12 Gauge 18.5in Camo](https://gunsnation.com/p/orthos-arms-raider-s4-12-gauge-18-5in-camo/UCExr5CTH)
- [Orthos Arms Raider S4 12 Gauge 18.5in Black](https://gunsnation.com/p/orthos-arms-raider-s4-12-gauge-18-5in-black/UCExr5CSB)
- [Orthos Arms Raider S4 12 Gauge 18.5in Gray](https://gunsnation.com/p/orthos-arms-raider-s4-12-gauge-18-5in-gray/UCExr5CSO)
- [Orthos Arms Raider S4 12 Gauge 18.5in Alpine Elite](https://gunsnation.com/p/orthos-arms-raider-s4-12-gauge-18-5in-alpine-elite/UCExryeas)
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*Data from [GunsNation](https://gunsnation.com)*