CMMG 22A5B28-BRZ MK4 22LR 4.5 MLTBRNZ (1OF2)

Imagine the thrill of assembling your own AR-15 lower receiver with precision components crafted entirely in the USA. The CMMG 22A5B28-BRZ MK4 lower parts kit transforms this dream into reality, allowing you to customize your firearm exactly to your specifications. Each part comes meticulously packaged in color-coded packets, making the assembly process not just accessible, but enjoyable. With this kit, you can expect flawless performance and peace of mind, knowing every component meets or exceeds military specifications.

Picture yourself on the range, confident in the stability and reliability of your firearm, thanks to the ZEROED Extended Bolt Catch and Adjustable Ambi Safety. Each element of this kit has been designed to contribute to seamless operation, letting you focus on what truly matters—honing your shooting skills. Whether you’re refining your marksmanship or enjoying a day of plinking with friends, the MK4 delivers performance you can trust.

The CMMG 22A5B28-BRZ MK4 kit caters to shooters of all skill levels. Newcomers will appreciate the provided interactive install walkthrough video and in-depth resource articles, making it easy to navigate your first build. Meanwhile, seasoned gun enthusiasts can leverage the high-quality features to make custom adjustments that elevate their shooting experience even further. It’s perfect for anyone looking to elevate their AR-15 with quality parts that reflect their personal style and shooting preferences.

This isn’t just a lower parts kit; it’s an opportunity to create a gun that resonates with your passion for shooting sports. The ZEROED Extended Magazine Release Button and Ambi Magazine Catch enhance your gun's efficiency in quick magazine changes, making those competitive match days a breeze. Step into the world of precision firearm assembly and feel the pride that comes from putting together a product that is truly yours. Equip your AR-15 with the MK4 and experience the difference for yourself.

Key Features

• Made in the USA
• Color-coded packets for easy assembly
• Includes all necessary installation hardware

Technical Specifications

What's in the Box

• ZEROED Extended Bolt Catch AR15
• Bolt Catch Plunger
• Bolt Catch Spring
• Bolt Catch Roll Pin
• ZEROED Trigger Guard
• Trigger
• Trigger Spring
• Disconnector
• Disconnector Spring
• Hammer
• Hammer Spring
• Trigger/Hammer Retaining Pins
• ZEROED 60/90 Adjustable Ambi Safety
• Safety Detent
• Safety Spring
• ZEROED Ambi Magazine Catch
• Magazine Catch Spring
• ZEROED Extended Magazine Release Button
• HD Pivot/Takedown Pins
• Detents
• Springs
• ZEROED Pistol Grip
• Grip Screw
• Grip Washer
• Buffer Retainer
• Buffer Retainer Spring

Compatibility & Requirements

• Compatible with AR-15 lower receivers

Dimensions & Weight