# Sig Sauer MCX Rattler .300 AAC Blackout 5.5in Black

**Brand:** SIG Sauer
**Category:** AR Style Rifles
**Caliber:** .300 AAC Blackout

## Specifications

- **Caliber:** .300 AAC Blackout
- **Barrel Length:** 5.5"
- **UPC:** 798681581313
- **SKU:** UCE3nOWKv

## Description

The Sig Sauer MCX Rattler is an AR-pattern semi-automatic rifle chambered in .300 AAC Blackout with a 5.5-inch barrel and 30+1 round capacity. It is a short-barreled rifle configuration; transfer requires additional federal paperwork. The Rattler ships in a black finish.

### Key Specifications
- **Brand**: Sig Sauer
- **Model**: MCX Rattler
- **Caliber**: .300 AAC Blackout
- **Action**: Semi Auto
- **Barrel Length**: 5.5 in
- **Capacity**: 30+1
- **Color/Finish**: Black

### Detailed Features
- 5.5-inch barrel in a short-barreled rifle configuration requiring additional federal paperwork for transfer
- .300 AAC Blackout chambering suited for both supersonic and subsonic loads
- 30+1 round capacity
- Black finish throughout

## Frequently Asked Questions

**Q: What caliber is the MCX Rattler?**

A: The MCX Rattler is chambered in .300 AAC Blackout.

**Q: Who makes the MCX Rattler?**

A: The MCX Rattler is made by Sig Sauer.

**Q: What is the barrel length of the MCX Rattler?**

A: The MCX Rattler has a 5.5-inch barrel.

**Q: How many rounds does the MCX Rattler hold?**

A: The MCX Rattler has a 30+1 round capacity.

**Q: What type of firearm is the MCX Rattler?**

A: The MCX Rattler is an AR-style semi-automatic rifle.

**Q: Where can I buy the MCX Rattler?**

A: Compare current vendor offers on this page.

## What Customers Say

*AI-generated insights from customer reviews*

Owners of the MCX Rattler point to its extremely compact size as the main draw. The 5.5-inch barrel makes it one of the smallest practical SBR platforms available, and those who run it suppressed with subsonic .300 Blackout consistently describe the combination as very quiet. Reliability is broadly reported as good, though a few owners note the short gas system can be finicky with certain budget subsonic loads.

On handling, opinions split along hand-size lines. Shooters with smaller hands find the controls natural; those with larger hands sometimes report the layout feels cramped. The short sight radius means almost every owner puts an optic on immediately. The folding stock gets consistent praise for how compact it makes the package during transport.

The Rattler sits at the premium end of the SBR market and owners generally accept that. The Sig Sauer build quality is the recurring justification. Aftermarket support for the MCX platform is solid overall, though some accessories designed for longer MCX variants need fitment work on the Rattler's shorter receiver.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Gunbuyer Com | $2699.99 |

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