ALL NFA RULES APPLY. (All Sales Are Final On NFA Items, No Returns)   At the heart of the PDX™ is our newly developed Maxim SCW™ stock system. This patent-pending system cuts down the length of the stock to 4”. The integrated BCG with interchangeable buffer weights gives you maximum performance and versatility without sacrificing form and functionality. The PDX uses a Direct Impingement system. The PDX™ is also equipped with newly invented Maxim HATEBRAKE™ muzzle booster. This patent-pending device significantly reduces recoil, decreases the flash signature, pushes gases and concussion wave downrange away from the operator and improves overall performance in short barrel pistols and rifles. SPECIFICATIONS:Caliber: 5.56 NATOBarrel Length: 5.5”Color: Arid Overall Length: 18.75”Weight (empty): 5 lbs 11 ozMuzzle device: Maxim Defense HATEBRAKE™ muzzle boosterStock: Maxim Defense SCW™ stock systemTrigger: ALG Combat Trigger (ACT) Magazines: Each PDX ships with one 20rd magazine