The best PCC Operating Systems: Blowback, roller-delayed, gas, radial delayed.

Published on October 9, 2021
Duration: 19:20

This review compares four primary operating systems for Pistol Caliber Carbines (PCCs) and Submachine Guns (SMGs): radial-delayed, straight blowback, roller-delayed, and gas-operated. Each system's pros and cons are detailed, with specific examples like the CMMG Banshee (radial-delayed), B&T SPC (blowback with hydraulic buffer), HK SP5/Stribog (roller-delayed), and Sig MPX (gas-operated). The host ultimately favors the B&T SPC for its balance of reliability and smooth shooting.

Quick Summary

The four main PCC operating systems are straight blowback, roller-delayed, gas-operated, and radial-delayed. Radial-delayed systems like the CMMG Banshee offer AR-15 familiarity but can have high reciprocating mass. Roller-delayed systems (HK SP5, Stribog) provide mild recoil but are complex. Gas-operated systems (Sig MPX) are accurate but can be gassy.

Chapters

  1. 00:00Intro: 4 PCC Operating Systems
  2. 01:25Radial Delayed: CMMG Banshee
  3. 06:21Straight Blowback: B&T SPC
  4. 09:37Roller Delayed: HK SP5 & Stribog
  5. 14:27Gas Operated: Sig MPX
  6. 18:02Conclusion & Host's Favorite

Frequently Asked Questions

What are the main operating systems for Pistol Caliber Carbines (PCCs)?

The four most common operating systems for PCCs and SMGs are straight blowback, roller-delayed blowback, gas-operated (often short-stroke piston), and radial-delayed blowback. Each has unique characteristics affecting recoil, complexity, and maintenance.

What is the advantage of a radial delayed blowback system like the CMMG Banshee?

Radial delayed systems offer familiar AR-15 controls and parts compatibility. However, they can have significant reciprocating mass and may require tuning for different ammunition types or when using suppressors.

How does B&T mitigate recoil in their blowback PCCs like the SPC?

B&T utilizes a patented hydraulic buffer system in their SPC and APC series firearms. This system gently decelerates the bolt, significantly reducing felt recoil and making them some of the softest-shooting blowback options available.

What are the pros and cons of roller-delayed blowback systems?

Roller-delayed systems, popularized by Heckler & Koch, offer very mild recoil and low bolt mass. The main drawbacks are mechanical complexity and potential for increased parts wear at higher round counts.

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