An MP5 That Shoots 5.56 or .308?! (AP53 & AP51)

Published on September 9, 2025
Duration: 12:24

This video from Classic Firearms provides an expert-level review of the Century Arms AP53 PDW (chambered in 5.56/.223) and AP51 PDW (chambered in .308/7.62x51 NATO). The presenter, demonstrating experienced authority, details the roller-delayed blowback mechanism, compares these unique MP5 variants to traditional platforms like the G3 and HK33, and offers practical insights from a range session. Key takeaways include the manageable recoil impulse for both calibers, the utility of the Navy-style lower receiver, and considerations for optic mounting and suppressor use.

Quick Summary

The Century Arms AP51 and AP53 are unique PDW firearms that adapt the classic MP5 roller-delayed blowback system to rifle calibers: .308/7.62x51 NATO for the AP51 and 5.56/.223 for the AP53. They offer surprisingly manageable recoil, especially the AP53, and can be fitted with optics and suppressors, making them versatile compact platforms.

Chapters

  1. 00:00Introduction: MP5 variants in rifle calibers
  2. 00:33Presenting the AP51 and AP53 PDWs
  3. 00:50AP53 overview and G3 comparison
  4. 01:05AP53 details: HK33 heritage, MKE import
  5. 01:32Roller-delayed blowback mechanism
  6. 02:06AP53 features: magazines, accessories, suppressors
  7. 03:59AP53 sights, optics, and feel
  8. 04:26AP51 (.308) features and comparison
  9. 05:57AP51 and AP53 weights
  10. 07:01Range session: AP51 (.308) shooting experience
  11. 08:39Range session: AP53 (5.56) shooting experience
  12. 10:14Conclusion: Which one is right for you?

Frequently Asked Questions

What are the Century Arms AP51 and AP53 PDWs?

The Century Arms AP51 and AP53 are PDW (Personal Defense Weapon) style firearms based on the MP5 platform, but chambered in rifle calibers: the AP51 in .308/7.62x51 NATO and the AP53 in 5.56/.223 Remington. They utilize a roller-delayed blowback action for smooth operation.

How does the roller-delayed blowback system affect shooting the AP51 and AP53?

The roller-delayed blowback system is known for providing a very smooth and straight-back recoil impulse. This makes both the AP51 and AP53 surprisingly controllable, with the AP53's 5.56/.223 caliber feeling exceptionally light, comparable to or even less than some 9mm firearms.

What are the key differences between the AP51 and AP53 PDWs?

The primary difference is caliber: the AP51 fires the larger .308/7.62x51 NATO round, while the AP53 fires 5.56/.223 Remington. This results in the AP51 having a more substantial recoil impulse, though still manageable, and the AP53 being exceptionally soft-shooting and wieldable.

Can the AP51 and AP53 PDWs be suppressed?

Yes, both firearms can be suppressed. The AP53 features a 1/2x28 thread pitch, and the AP51 has a 5/8x24 thread pitch. It is crucial to check suppressor concentricity to avoid baffle strikes, especially with these compact platforms.

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