Maxim Defense MXM47802 PDX 5.56x45mm NATO 5.50" 20+1 Arid Brown Maxim SCW Stock Arid Brown Polymer Grip

The Maxim Defense PDX 5.56x45mm NATO pistol is a subcompact rifle platform purpose-built for close-quarters work. Recognized as Best of SHOT 2019 by RECOIL Magazine, this short-barreled firearm stems directly from Tier 1 operator input gathered during the SOCOM PDW solicitation. At just 18.75 inches overall length, it delivers rifle ballistics and controllability in a package small enough for confined spaces, vehicles, and tactical entries where conventional rifles become liabilities.

The PDX's defining feature is the Maxim SCW (Short Cycle Weapon) system—a patent-pending stock mechanism that collapses to just 4 inches while housing an integrated bolt carrier group with interchangeable buffer weights. This engineering lets you tune the cycling rate and recoil impulse to your ammunition and preferences without swapping internal components. The 5.5-inch barrel is threaded 1/2x28 for suppressor mounting, and the rifle ships with the proprietary HATEBRAKE muzzle device. This booster actively reduces felt recoil, minimizes flash signature, and directs gases and concussion downrange—practical advantages in enclosed environments or low-light scenarios.

Built from aerospace-grade materials (6AL-4V titanium, 17-4 stainless steel, 7075 and 6061 aluminum) and hard-anodized for durability, the PDX tips the scales at 5 lbs 11 oz. It feeds from standard AR-platform magazines (20+1 capacity shown here) and wears a Maxim SCW stock and arid brown polymer grip for a cohesive, purpose-driven appearance. Whether you're building a vehicle rifle, a home-defense platform, or an SBR for authorized use, the PDX proves that compact doesn't mean compromised.