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 perceived recoil of roller-delayed blowback firearms, contrasting them with gas-operated and direct blowback systems. It explains how the roller system delays bolt carrier group movement, leading to a distinct recoil impulse. The discussion highlights how this impulse affects sight tracking and controllability, particularly in performance shooting scenarios, and compares the handling characteristics of various platforms like the MP5, AK4D, HK93, SCAR, URGI, and AR9.

Quick Summary

Roller-delayed blowback firearms, like the MP5, are known for their reliability due to a system where rollers on the bolt head lock into the trunnion, delaying bolt opening. This mechanism allows chamber pressures to drop before cycling, reducing stress. The recoil impulse feels like a distinct 'snap' or softer push, differing from gas-operated systems and potentially aiding sight tracking in performance shooting.

Chapters

  1. 00:33Sponsor Message: Midway USA
  2. 01:35Roller Delayed Operating System
  3. 02:13How Roller Delayed Blowback Works
  4. 04:03Transfer of Momentum Explained
  5. 05:01Firearm Mechanics: Locking Piece & Rollers
  6. 06:14Delay Mechanism and Bolt Speed
  7. 06:55Direct Blowback vs. Roller Delayed
  8. 08:06Shooter's Experience: Recoil Impulse
  9. 09:10Sight Movement and Target Tracking
  10. 10:10Full Auto Control: MP5 vs AR
  11. 11:06AK4D Recoil and Control
  12. 12:13Impulse Comparison: AK4D vs. Other Systems
  13. 13:17SCAR Performance and Cadence
  14. 14:375.56 Roller Delayed: HK93 vs. URGI
  15. 15:10HK93 Recoil with Suppression
  16. 16:09URGI Recoil Impulse Comparison
  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 stems from their unique operating system. The bolt head features rollers that lock into the trunnion or barrel extension, effectively delaying the opening of the bolt. This delay allows chamber pressures to decrease significantly before the bolt carrier group cycles, reducing stress on components and contributing to the system's robustness.

How does the recoil impulse of a roller-delayed system differ from a gas-operated system?

Roller-delayed systems, like the MP5, are often described as having a 'snap' or a softer push recoil impulse. In contrast, gas-operated systems such as the AR-15 or SCAR tend to feel more like a direct push or a 'wing turn' movement. This difference in how recoil energy is transferred to the shooter can significantly impact sight tracking and perceived controllability.

Why are direct blowback systems not common in high-pressure rifle cartridges like .308?

Direct blowback systems rely solely on the mass of the bolt carrier group to counteract recoil. For high-pressure cartridges like .308, this would necessitate an impractically heavy bolt (estimated at 23 lbs for a G3 equivalent). Direct blowback is more suitable for lower-pressure cartridges like 9mm, where less bolt mass is required.

How does the recoil impulse affect performance shooting with roller-delayed firearms?

The distinct recoil impulse of roller-delayed firearms can be advantageous in performance shooting. The 'snap' allows shooters to more easily track the sights or red dot as they move during recoil and return to the target. This predictability can facilitate faster and more accurate follow-up shots compared to systems with a more abrupt or less predictable recoil pattern.

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