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.