The Mightiest 5.5 Inches You'll ever handle - The PDX-SD (5.5" Suppressed 5.56)

Published on April 28, 2024
Duration: 37:39

The Maxim Defense PDX-SD is a highly specialized 5.56mm SBR featuring a 5.5-inch barrel and an integrated, user-serviceable suppressor. Despite its short length, it demonstrates surprisingly good accuracy at 100 yards and offers superior terminal ballistics compared to pistol-caliber carbines. Its compact design and soft-shooting suppressed nature make it suitable for truck gun or home defense roles, though its engineering complexity places it in the high-end PDW market.

Quick Summary

The Maxim Defense PDX-SD is a compact 5.5-inch barreled 5.56mm SBR with an integrated, user-serviceable suppressor. It demonstrates good 100-yard accuracy and offers superior terminal ballistics over 9mm PCCs, making it a specialized tool for defense roles.

Chapters

  1. 00:00Intro & Shooting Montage
  2. 01:05Introducing the PDX-SD
  3. 03:04Technical Specifications (5.5" Barrel)
  4. 05:41100 Yard Accuracy Testing
  5. 10:06PDW Philosophy & Comparisons
  6. 14:16Suppressor Design & Maintenance
  7. 18:07Internal Mechanics Breakdown
  8. 20:03Final Verdict & Use Cases

Frequently Asked Questions

What makes the Maxim Defense PDX-SD unique?

The PDX-SD is unique for its extremely compact 5.5-inch barrel combined with an integrated, user-serviceable suppressor. It features proprietary internal mechanics, including a shortened bolt carrier group and buffer system, to reliably cycle 5.56mm in such a short platform.

How accurate is the 5.5-inch barrel of the PDX-SD at 100 yards?

Accuracy testing at 100 yards with both 55-grain and 77-grain ammunition yielded acceptable results for its size. While there are ballistic trade-offs due to the short barrel, it performs well for its intended compact role.

What are the advantages of the PDX-SD's integrated suppressor?

The integrated suppressor is user-serviceable, featuring a monocore design that is easy to clean. It's specifically tuned for the short-barreled system, helping to manage gas and recoil, contributing to the firearm's soft-shooting nature.

Is the 5.56mm round effective from the short barrel of the PDX-SD?

Yes, the review argues that even with some velocity loss from the 5.5-inch barrel, 5.56mm offers superior terminal ballistics compared to 9mm rounds used in Pistol Caliber Carbines (PCCs).

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