Enhance your DISSENT MK4 with our advanced .22 ARC (Advanced Rifle Cartridge) upper group, whether you're starting from scratch or expanding your caliber options. This upper group seamlessly pairs with any Mil-Spec compatible lower receiver and includes a 1913 picatinny rear end plate for easy customization with accessories such as slings for pistol builds or folding stocks for compact carbines. Engineered with our innovative direct impingement Compact Action, DISSENT upper groups consolidate the entire action and recoil assembly within the upper receiver, reducing overall bulk and length compared to traditional AR pistols. The forward non-reciprocating side charger ensures swift bolt operation without disrupting your aim, with left side chargers standard on direct impingement DISSENT models; right side charging handles are also available. Each DISSENT upper group comes equipped with a 1913 picatinny rail end plate, eliminating the need for a lower receiver buffer tube. Whether you're aiming for suppressed shooting or precise tuning with your preferred ammunition, our adjustable gas block provides exacting control over the gas system, delivering optimal performance tailored precisely to your preferences. Discover the perfect balance of performance and versatility with DISSENT.

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Shipping Restrictions

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.