Maxim Defense Defense Pdx 300Blk 5.5 Arid Scw

The Maxim Defense PDX in .300 Blackout with 5.5" barrel and Arid SCW is a purpose-built short-stroke rifle purpose-engineered for close-quarters work where compact footprint and fast handling matter. Born from professional-grade requirements, this is the kind of gun that earns respect through design choices, not marketing claims. At just 18.75 inches overall length, it's built around Maxim's patent-pending SCW (Short Compact Weapon) system—a modular platform that integrates the bolt carrier group, keeps the stock length down to 4 inches, and lets you swap buffer weights to fine-tune performance for your ammunition and mission profile.

The .300 Blackout round finds its sweet spot in a short barrel, and this PDX setup pairs that caliber with a 5.5" tube threaded 5/8x24 (ready for a suppressor, which is where this gun really sings). Recoil management comes from Maxim's HATEBRAKE muzzle device—a booster that doesn't just tame the gun, it redirects gas and concussion downrange rather than back at you, and keeps the flash signature clean. Built from a mix of 6Al-4V titanium, 17-4 stainless, and 7075/6061 aluminum with hard anodizing, this rifle is light at 5 lbs 11 oz without sacrificing durability.

This isn't a range toy or a mall-ninja aesthetic play. The PDX earned "Best of SHOT 2019" from RECOIL Magazine because it solves real problems for people who understand what a weapon is supposed to do in its intended role. If you're looking for a suppressed, short .300 Blackout carbine that doesn't compromise on build quality or ergonomics, the Maxim Defense PDX checks every box.

Key Features

• Patent-pending Maxim SCW system with integrated bolt carrier group and interchangeable buffer weights
• Compact 18.75" overall length and 4" stock for tight quarters handling
• .300 Blackout with 5.5" barrel threaded 5/8x24
• HATEBRAKE muzzle booster reduces recoil, flash, and directs concussion downrange
• Lightweight build: 5 lbs 11 oz
• Durable materials: 6Al-4V titanium, 17-4 stainless, 7075 and 6061 aluminum with hard anodizing
• Arid finish for low-signature aesthetic

Specifications

Frequently Asked Questions

What barrel length and caliber does the PDX come in?

The Maxim Defense PDX is chambered in .300 Blackout with a 5.5-inch barrel. This pairing is optimized for subsonic ammunition and suppressed fire while maintaining velocity and energy in a compact footprint.

Is the PDX threaded for a suppressor?

Yes. The muzzle is threaded 5/8x24, the standard commercial suppressor thread pitch for .300 Blackout. The integrated HATEBRAKE muzzle booster also functions as a suppressor mount platform.

How compact is this rifle?

At 18.75 inches overall with a 4-inch stock, the PDX is designed for close-quarters operation. The SCW system keeps everything tight without sacrificing control or the ability to customize performance with swappable buffer weights.

What materials are used in the PDX?

The PDX is built from a combination of 6Al-4V titanium, 17-4 stainless steel, and 7075 and 6061 aluminum with a hard-anodized finish, delivering durability and corrosion resistance while keeping total weight down to 5 lbs 11 oz.