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.