Experience enhanced versatility with the DISSENT MK4 by adding our .22 ARC (Advanced Rifle Cartridge) upper group to your arsenal, whether starting from scratch or expanding your caliber options. Designed to pair seamlessly with any Mil-Spec compatible lower receiver, it includes a 1913 picatinny rear end plate for effortless customization with accessories like slings for pistol configurations or folding stocks for compact carbines. Featuring our innovative patent-pending direct impingement Compact Action, DISSENT upper groups house the entire action and recoil assembly within the upper receiver, reducing both bulk and length compared to traditional AR pistols. The forward non-reciprocating side charger ensures swift bolt operation without compromising target acquisition. Standard on direct impingement DISSENT models is a left side charger, with options for right side charging handles available here. Each DISSENT upper group is equipped with a 1913 picatinny rail end plate, eliminating the need for a lower receiver buffer tube. Whether you prefer suppressed shooting or wish to optimize performance with specific ammunition, the adjustable gas block allows you to fine-tune the gas system precisely to your preferences. Experience optimal performance, never too much and never too little, with DISSENT.