Roller Delayed Guns Better or Worse? Feat: AK4D, HK93, MP5 vs SCAR, URGI, AR9 [Range Talk]

Published on May 30, 2024
Duration: 18:05

This video delves into the mechanics and felt recoil of roller-delayed blowback firearms, contrasting them with gas-operated and direct blowback systems. It explains how the roller-delayed system, exemplified by the MP5 and G3, uses rollers to lock the bolt and delay bolt carrier speed, resulting in a softer, 'push-like' recoil impulse compared to the 'snap' of AR-platform rifles. The discussion highlights how this difference impacts sight movement and control, particularly during rapid fire, and explores how different roller-delayed platforms like the AK4D and HK93 present unique recoil characteristics that require shooter adaptation.

Quick Summary

Roller-delayed blowback firearms, like the MP5, offer a distinct recoil impulse described as a soft 'push' rather than a sharp 'snap' common in AR-platform rifles. This system uses rollers to delay bolt carrier speed, enhancing reliability and potentially aiding in sight reacquisition during rapid fire.

Chapters

  1. 00:33Midway USA Sponsorship
  2. 01:35Roller Delayed Operating System
  3. 02:13How Roller Delayed Blowback Works
  4. 04:03Transfer of Momentum Explained
  5. 05:01Mechanism of Roller Delay
  6. 06:14Angle of Locking Shoulder
  7. 06:55Comparison to Direct Blowback
  8. 08:06Felt Recoil of Roller Delayed
  9. 09:10Sight Movement and Recoil Feel
  10. 10:10AR vs. MP5 Full Auto Control
  11. 11:12AK4D Recoil Characteristics
  12. 12:13AK4D vs. Other Systems
  13. 13:17SCAR Shooting Example
  14. 14:47HK93 vs. URGI Comparison
  15. 15:10HK93 Recoil Impulse
  16. 16:38URGI Shooting Example
  17. 17:26Recoil Impulse Summary

Frequently Asked Questions

What makes roller-delayed blowback firearms like the MP5 reliable?

The reliability of roller-delayed blowback firearms is largely attributed to their robust locking mechanism. The rollers engage locking recesses, delaying the opening of the action and managing the forces generated by firing, which contributes to consistent and dependable operation.

How does the recoil of a roller-delayed system differ from an AR-15?

Roller-delayed systems, like those in an MP5, typically produce a softer, 'push-like' recoil impulse. In contrast, AR-15s, which are gas-operated, tend to have a sharper, 'snap-like' recoil. This difference can affect how much the sights move and how quickly a shooter can reacquire their target.

Why aren't .308 caliber rifles typically direct blowback?

Direct blowback systems are generally not used for high-pressure cartridges like .308 because they would require an impractically heavy bolt to safely manage the recoil and prevent the action from opening too soon. Roller-delayed systems provide a mechanical advantage to handle these forces.

What is the key principle behind the roller-delayed blowback mechanism?

The core principle is the use of rollers on the bolt head that lock into the trunnion or barrel extension. When fired, the expanding gases push the bolt carrier rearward, but the rollers are forced inward, delaying the unlocking of the bolt and managing the bolt carrier's speed.

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