Expand your DISSENT MK4's caliber versatility with our .22 ARC (Advanced Rifle Cartridge) upper group, whether you're starting from scratch or enhancing your existing setup. Pair it seamlessly with any Mil-Spec compatible lower receiver and utilize the included 1913 picatinny rear end plate to customize with accessories such as slings for pistol builds or folding stocks for compact carbines. Our innovative patent-pending direct impingement Compact Action design consolidates the entire action and recoil assembly within the upper receiver, reducing bulk and overall length compared to traditional AR pistols. The forward non-reciprocating side charger enables swift bolt operation without disrupting your aim. Standard on direct impingement DISSENT models, left side chargers ensure efficient handling, with right side options available here. Every DISSENT upper group includes a 1913 picatinny rail end plate for versatile configuration without requiring a lower receiver buffer tube. Whether you prefer suppressed shooting or want to optimize performance with specific ammunition, the adjustable gas block provides precise control over the gas system, ensuring optimal performance tailored to your preferences every time.

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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.