Brand: LWRC
Model: IC A5 SBR Complete Upper
Platform: AR-15
Caliber: .300 Blackout
Barrel Length: 10"
Barrel Description: Cold-Hammer Forged Barrel
Finish: OD Green
Gas System: Short Stroke Gas Piston System
Muzzle Device: A2 Birdcage Flash Hider
Receiver Material: Aluminum
Handguard: LWRCI Free-Float Rail
Attachment Style: M-LOK
Bolt Carrier Group: Nickel Boron Coated
Charging Handle: LWRCI Ambidextrous Charging Handle

Features

The LWRCI ICMKII A5 .300 Blackout 10-inch SBR upper is a premium short-barrel upper receiver assembly built around LWRC International’s proprietary short-stroke gas piston A5 system, designed to deliver reliable .300 AAC Blackout performance in compact rifle and SBR configurations. It features a cold hammer forged barrel with a 1:7 twist rate and 5/8x24 threaded muzzle, supporting a wide range of ammunition and compatibility with various muzzle devices or suppressors.

The monoforge upper incorporates a free-float modular rail with an integrated mounting surface, along with an adjustable two-position gas block for optimized suppressed or unsuppressed operation. Additional features include backup iron sights and an ambidextrous charging handle for enhanced usability. Designed to pair with standard AR-15 lowers, this upper delivers the durability, reliability, and refined performance expected from LWRCI’s IC-MKII line for close-quarters, duty, or precision-focused applications.

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It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.