Upgrade your DISSENT MK4 with our .22 ARC (Advanced Rifle Cartridge) upper group, whether you're starting from scratch or expanding your caliber options. Pair it effortlessly with any Mil-Spec compatible lower receiver and utilize the included 1913 picatinny rear end plate to customize with accessories like slings for a pistol build or a folding stock for a compact carbine setup. Our patent-pending direct impingement Compact Action design ensures that DISSENT upper groups house the entire action and recoil assembly within the upper receiver, resulting in reduced bulk and length compared to traditional AR pistols. The forward non-reciprocating side charger facilitates quick bolt operation without losing target acquisition and left side chargers are standard on direct impingement DISSENT models, with right side options available here. Every DISSENT upper group includes a 1913 picatinny rail end plate for versatile configuration without the need for a lower receiver buffer tube. Fine-tune your DISSENT for suppressed shooting or optimize it for your preferred ammunition with the adjustable gas block, providing precise control over the gas system for optimal performance 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.