CMMG MK4 .300BLK Resolute Upper Group Receiver 16.1in Midnight Bronze
3 options
- Coyote · Tanout of stock
- Midnight · Bronze, this page
- Tungstenout of stock
Click to see full view
CMMG
Overview
The CMMG Mk4 .300BLK Resolute Upper Group Receiver features a complete assembly optimized for the .300 Blackout caliber, providing builders with a reliable upper that delivers exceptional performance. With a barrel length of 16.1 inches, this upper is designed to balance maneuverability and ballistic effectiveness, making it suitable for various shooting applications. This upper often finds its place in builds focused on versatility and compactness, especially for those interested in suppressor-friendly setups.
Specifications
CMMG MK4 .300BLK Resolute Upper Group Receiver 16.1in Midnight Bronze
3 options
- Coyote · Tanout of stock
- Midnight · Bronze, this page
- Tungstenout of stock
Build history on GunPartPicker
Builders on GunPartPicker first added the CMMG MK4 .300BLK Resolute Upper Group Receiver 16.1in Midnight Bronze to a build in August 2026.
Today the one retailer we track is out of stock. Listed prices start at $819.99 at Optics Planet for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
Not sure which upper receiver to pick?
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
Frequently Built With
Popular alongside upper receivers on GunPartPicker
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Radian Raptor Charging Handle & Talon Safety Selector Combo - OD Green
Magpul AFG-2 Angled Fore Grip - Black
Battle Arms Development Rack Ambidextrous AR-15 Charging Handle - Mod C
Aero Precision M4E1 Complete Lower Receiver W/MOE SL Grip & SL-S Carbine Stock
Bravo Company M16 Bolt Carrier Group Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
No reviews yet. Be the first to review this product!