AR-15 .40 S&W 4" Compression Series Micro Pistol Kit – Build Your Custom Micro Pistol

.40 S&W Micro Pistol Kit: Specs & Features

Transform your shooting experience with the AR-15 40 S&W 4" Complete Compression Series Micro Pistol Kit. Perfect for enthusiasts who want a high-performance build with the power of the 40 S&W caliber, this kit includes everything you need (except the 80% stripped lower receiver, available separately). Customize your AR-15 pistol with your choice of Cerakote colors for a personalized touch, and enjoy the quality, reliability, and performance that come with each component.

Whether you're looking to build a new pistol or add your unique touch to an existing build, the AR-15 40 S&W 4" Micro Pistol Kit has everything you need to complete your custom firearm.

Kit Includes:

• 4" 40 S&W 1:16 Twist M4 4150 Barrel: Precision-engineered for 40 S&W ammunition, this barrel offers superior performance and accuracy, ensuring every shot is on target. Blowback operation.
• 5/8x24 Crush Washer: Securely attaches your muzzle device for improved accuracy and recoil management.
• 5/8x A2 Flash Hider (Nitride): Reduces muzzle flash for better concealment during shooting and a sleek, tactical aesthetic.
• Forged AR-15 Upper Receiver: Built for durability and precision, ensuring reliability with every shot.
• 4" M-LOK Handguard (with Barrel Nut & Hardware): Slim, lightweight, and perfect for adding accessories without compromising performance.
• 5.56 Ejection Door Assembly: Smooth ejection for flawless cycling.
• Forward Assist Assembly: Quick chambering and reliable function for consistent performance.
• 5.56 Charging Handle: Ergonomically designed for ease of use and durability.
• M16 Complete Nitride Bolt Carrier Group (BCG): Made for the 40 S&W caliber, this high-quality BCG ensures long-lasting reliability and smooth cycling.
• 5.56 Complete Lower Parts Kit (LPK): Includes all necessary components for completing your lower receiver, including an Ultra-Light Aluminum Pistol Grip for comfort and control.
• AR-15 Micro Pistol Buffer Tube Assembly: Designed for micro pistols, the buffer tube assembly comes with a 7.5 oz buffer for smooth cycling and improved recoil management.

Custom Color Options:

Personalize your build with a wide range of Cerakote color options for the rail, buffer tube, and pistol grip. Mix and match colors to create a truly unique look for your custom build. The rest of the kit components come in classic tactical black for a clean, professional appearance.

Available Colors:

• Burnt Bronze
• Flat Dark Earth (FDE)
• OD Green
• Robins Egg
• Pink
• Red
• Hunter Orange
• Bright White
• Lemon Zest
• Zombie Green

Kit Details:

• Unassembled Kit: Ideal for DIY builders who want to customize every detail of their micro pistol.
• No Lower Receiver Included: Compatible with glock style 9mm lower receivers (sold separately).
• 100% USA-Made Components: High-quality materials and craftsmanship ensure top-tier performance.
• Customizable: Complete your build with your choice of sights, magazine, and additional accessories (not included).

Perfect for Customization and Performance: The AR-15 40 S&W 4" Complete Compression Series Micro Pistol Kit is perfect for those looking to build a compact, reliable pistol with outstanding performance. Whether you’re building a personal defense weapon or a unique range companion, this kit provides everything you need to create your dream firearm with your personal touch.

FAQ

Is a lower receiver included?

No. The kit ships without a lower receiver, so you complete it on your own lower. Check your state rules before ordering.

What lower does it fit?

A dedicated pistol-caliber AR lower, such as a Glock-pattern lower using .40 S&W Glock-style magazines. A standard AR-15 lower with 5.56 magazines will not feed it.

How does it operate?

It is a direct blowback system, so it has no gas tube. A heavy PCC buffer is used for reliable cycling.

Related: .40 S&W Micro ARP · all Micro ARP pistols and uppers

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