# CMMG Banshee Mk4 .300 AAC Blackout 12.5in Black

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

## Specifications

- **Caliber:** .300 AAC Blackout
- **Barrel Length:** 12.5"
- **UPC:** 810144724195
- **SKU:** UCEGJAhSF

## Description

The CMMG Banshee Mk4 is a semi-automatic AR-15 pistol chambered in .300 AAC Blackout with a 12.5-inch threaded barrel. It has a 30+1 capacity, an M-LOK handguard, and polymer grips. The 12.5-inch barrel configuration classifies this as a pistol; transfer follows standard pistol procedures, though some configurations with a stabilizing brace may require additional federal paperwork depending on current regulations.

### Key Specifications
- **Brand**: CMMG
- **Model**: Banshee Mk4
- **Caliber**: .300 AAC Blackout
- **Action**: Semi Auto
- **Capacity**: 30+1
- **Barrel Length**: 12.5"
- **Color/Finish**: Black

### Detailed Features
- 12.5-inch threaded barrel
- M-LOK handguard for accessory mounting
- Polymer grips
- 30+1 round capacity
- AR-15 pistol platform

## Frequently Asked Questions

**Q: What caliber is the Banshee Mk4?**

A: The Banshee Mk4 is chambered in .300 AAC Blackout.

**Q: Who makes the Banshee Mk4?**

A: The Banshee Mk4 is made by CMMG.

**Q: What type of firearm is the Banshee Mk4?**

A: It is a semi-automatic AR-15 pistol on CMMG's Mk4 platform.

**Q: What is the barrel length of the Banshee Mk4?**

A: The Banshee Mk4 has a 12.5-inch barrel.

**Q: How many rounds does the Banshee Mk4 hold?**

A: It has a 30+1 round capacity.

**Q: Does the Banshee Mk4 have a threaded barrel?**

A: Yes. The Banshee Mk4 has a 12.5-inch threaded barrel.

**Q: Where can I buy the Banshee Mk4?**

A: Compare current vendor offers on this page.

## What Customers Say

*AI-generated insights from customer reviews*

The Banshee Mk4 in .300 AAC Blackout has a following among owners who want a compact AR-15 platform for close-range use. The 12.5-inch barrel length and .300 Blackout chambering are considered a practical combination, especially with subsonic loads, and owners frequently mention running suppressed setups with this configuration.

Build quality gets positive marks from most Banshee Mk4 owners. The M-LOK handguard is well-regarded for keeping weight down while allowing light mounting. The pistol tube configuration draws some criticism from those who prefer a folding or adjustable brace for better control at distance.

CMMG's radial delayed blowback system is a recurring topic. Fans say it runs reliably with both supersonic and subsonic .300 Blackout without gas adjustment. Detractors point to the proprietary nature of the bolt carrier group as a concern for parts sourcing, though CMMG aftermarket support is generally considered adequate.

## Pricing

**4 offers available**

| Vendor | Price |
|--------|-------|
| Buds Gun Shop | $1144.99 |
| Shootingsurplus Com | $1187.69 |
| Grabagun Com | $1219.99 |
| Classicfirearms Com | $1346.88 |

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