AR-40 4" Slick Side LRBHO Pistol Upper with BCG - .40 S&W | Moriarti Armaments

Uppers

AR-40 4" Slick Side LRBHO Pistol Upper with BCG - .40 S&W | Moriarti Armaments

The AR-40 4" Slick Side LRBHO Pistol Cone Complete Upper Assembly with BCG in .40 S&W is the perfect solution for your custom AR-40 build. Designed for Glock-style lowers, this upper features an integrated LRBHO (Last Round Bolt Hold Open) for enhanced functionality and performance. Built on a high-quality 7075-T6 billet upper receiver, this assembly ensures durability and precision, making it an excellent choice for pistol-length builds. Whether you're a seasoned AR enthusiast or a first-time builder, this upper provides all the components you need to complete your AR-40 pistol setup.

Key Features:

• Barrel: The 4" .40 S&W match-grade barrel is crafted from 4150 chrome moly steel with a durable black nitride finish, designed to withstand wear and provide reliable performance. The 1:16 twist rate ensures stable projectile flight for improved accuracy. It also features 5/8x24 muzzle brake threads and is finished off with a A2 flash hider to reduce muzzle flash and improve recoil management.

• Slick Side Upper Receiver: Constructed from certified 7075-T6 aircraft billet aluminum, this receiver is hard coat anodized to MIL-A-8625, Type 3, Class 2 specifications for extra durability. The integrated LRBHO (Last Round Bolt Hold Open) feature ensures that the bolt stays locked back after the last round is fired, adding convenience during reloads.

• Gas System: Designed for blowback operation, this upper assembly is optimized for .40 S&W rounds, providing smooth cycling without the need for a traditional gas impingement system.

• M-LOK Handguard: The lightweight 4" slim M-LOK handguard is made from aircraft-quality aluminum and hard coat anodized for added strength and corrosion resistance. It provides a slim, compact profile while offering the versatility to attach accessories for further customization.

• Bolt Carrier Group (BCG): The AR-40 .40 S&W/10mm BCG is precision-milled from US-made 8620 steel with a mag phosphate finish, providing reliable cycling and long-term durability. Compatible with Glock-style MA-9 lowers (or AR-15 lowers with mag adapter), the BCG features an M-16 cut, making it versatile for legal machine gun configurations.

• Charging Handle: A standard AR-15 charging handle is included, ensuring smooth operation and ease of use when cycling the action.

Assembly and Testing: This upper assembly comes completely assembled and tested, so you can enjoy the reliability and accuracy of your custom build right out of the box.

Made in the USA by Moriarti Armaments, this high-performance upper is engineered for long-lasting durability and precision, making it the ideal addition to your AR-40 S&W pistol or rifle build.

CURRENT ETA: 6-8 WEEKS

Images may not be the exact representation of the product