# CMMG Mk4 RCE 5.56 NATO Rifle with Geissele SSA Trigger

**Brand:** CMMG
**Category:** AR Style Rifles
**Caliber:** 5.56 NATO

## Specifications

- **Caliber:** 5.56 NATO
- **Barrel Length:** 16.1"
- **Capacity:** 30 rounds
- **Weight:** 107.2 oz
- **UPC:** 815835015477
- **SKU:** UCEMWGa9t

## Description

The CMMG Mk4 RCE is a 5.56x45mm NATO semi-auto rifle built on a forged 7075-T6 aluminum upper receiver and a nitrided 4140 chromoly steel lower. The standout components are the Geissele SSA two-stage trigger and the CMMG SV muzzle brake, both of which meaningfully improve how the rifle shoots rather than just padding the spec sheet.

### Key Specifications
- **UPC:** 815835015477
- **Caliber:** 5.56x45mm NATO
- **Capacity:** 30 rounds
- **Barrel Length:** 16.1 inches
- **Weight:** 6.7 lbs
- **Finish:** Stainless Steel

### Detailed Features

- **Receiver Construction**: Forged 7075-T6 aluminum upper with a nitrided 4140 chromoly lower, a combination that holds up under extended use.
  
- **16.1" Medium Taper Barrel with SV Muzzle Brake**: The CMMG SV brake cuts felt recoil and muzzle rise noticeably. At 16.1 inches the barrel keeps the rifle legal at standard lengths while maintaining reasonable velocity.

- **Geissele SSA Two-Stage Trigger**: A legitimate upgrade over mil-spec triggers. The first stage takes up slack cleanly, and the second breaks at a consistent weight, useful for both fast shooting and precise work.

- **Ergonomics**: A2 pistol grip, Magpul MOE trigger guard, and Magpul CTR buttstock with six length-of-pull positions.

### Target Audience
The Mk4 RCE suits shooters who want a factory-built AR that doesn't need immediate trigger work. Experienced shooters who'd normally budget for a Geissele trigger upgrade will find that cost absorbed here.

### Usage Scenarios

- **Sport Shooting**: The Geissele trigger and SV brake make a real difference in competition where split times and follow-up accuracy matter.

- **Home Defense**: At 6.7 lbs with a 16.1-inch barrel, it's maneuverable enough for indoor use while the 5.56 chambering gives you good ammunition options.

- **Tactical Training**: The reliability and quality components hold up through high-round-count training sessions without the trigger degradation you'd see on budget builds.

## What Customers Say

*AI-generated insights from customer reviews*

Owners of the CMMG Mk4 RCE generally come away satisfied, with the Geissele SSA trigger getting the most consistent praise. It's the feature that distinguishes this rifle most clearly from comparable AR builds. The two-stage pull is noticeably cleaner than what ships on most factory rifles, and shooters who've spent time on both describe the difference as immediate.

Build quality reads as solid across the board. CMMG has a reputation for tight tolerances, and owners of the Mk4 RCE mostly confirm that the rifle holds up over time and cycles reliably.

The main sticking point is price. The Mk4 RCE costs more than a basic AR-15, and buyers who aren't familiar with what a Geissele trigger costs separately sometimes feel the sticker price is hard to justify. Buyers who are familiar with the components tend to view the pricing as fair given what's included.

Customization discussions sometimes come up, some users want different furniture or a different muzzle device, but the standard Magpul CTR and MOE setup is generally well-regarded as a starting point.

## Pricing

**1 offers available**

| Vendor | Price |
|--------|-------|
| Guns Com | $1275.99 |

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