Maxim Defense PDX-SD 5.56 5.5″ 20RD SBR ARID

The Maxim Defense PDX-SD is a suppressor-tuned short-barreled rifle designed as an ultra-compact platform for full‑power cartridges. It is chambered in .223 REM/5.56 NATO and features a 5.5″ barrel with a 20-round capacity. The PDX-SD uses a purpose-built suppressor interface and is configured with a Maxim SCW stock and polymer grip in a Flat Dark Earth finish. The design emphasizes reduced gas blowback, manageable cyclic behavior, and user-serviceable components for routine maintenance.

Key Specifications

• The model is PDX-SD.
• The product type is SBR.
• The subcategory is Short-Barreled Rifles.
• The caliber is .223 REM/5.56 NATO.
• The barrel length is 5.5″.
• The capacity is 20 rounds.
• The action is Semi-Auto.
• The stock type is Maxim SCW.
• The grip material is Polymer.
• The finish/color is Flat Dark Earth.

Built around a purpose-designed suppressor interface and serviceable suppressor components, the PDX-SD offers a compact, durable platform for shooters who prioritize a short overall length without sacrificing full-power cartridge performance. Its suppressor-tuned characteristics help control gas blowback and cyclic behavior while simplifying maintenance, making it a practical choice for users seeking a high-functioning, compact rifle configuration.