What's A Piston Gun Good For? Adams Arms

Published on November 10, 2023
Duration: 8:49

This video from The VSO Gun Channel reviews the Adams Arms complete AR-15 piston upper receiver, comparing it to traditional direct impingement (DI) systems. The instructor highlights the primary benefit of piston guns: running cleaner by venting hot gas away from the receiver. The review details the Adams Arms system's design, including its monolithic MLOK rail, adjustable gas block with a set screw for fine-tuning, and a robust piston rod mechanism. While praising its clean operation and solid construction, a minor critique is offered regarding the small size of the gas block's set screw.

Quick Summary

AR-15 piston systems, like the Adams Arms upper, offer a significant advantage by running much cleaner than traditional direct impingement (DI) guns. This is achieved by venting hot gas away from the receiver, reducing fouling and improving reliability. The Adams Arms system features an adjustable gas block for fine-tuning performance.

Chapters

  1. 00:57Introduction: Piston vs DI ARs
  2. 01:22Adams Arms Piston Upper Overview
  3. 02:02How Piston Systems Work
  4. 02:27Upper Receiver Features
  5. 02:55Chambering and Twist Rate
  6. 03:06Why Choose a Piston Gun?
  7. 03:23Piston Mechanism Details
  8. 04:09Adjustable Gas Block Explained
  9. 04:33Range Test: DI vs Piston Cleanliness
  10. 05:41Piston System Runs Cleaner
  11. 06:04On-the-Fly Adjustments
  12. 06:28Critique: Gas Block Set Screw
  13. 07:26Flawless Functionality
  14. 07:33Piston vs DI Reliability
  15. 08:07Adams Arms Build Quality
  16. 08:37Conclusion: What Piston Guns Are Good For

Frequently Asked Questions

What is the main advantage of an AR-15 piston system over a direct impingement (DI) system?

The primary advantage of an AR-15 piston system is that it runs significantly cleaner. By venting hot gas away from the receiver, it prevents powder residue and fouling from accumulating in the bolt carrier group and chamber, leading to more reliable operation and less frequent cleaning.

How does the Adams Arms piston system differ from a standard DI AR-15 gas system?

Instead of routing hot gas directly into the receiver like a DI system, the Adams Arms piston system uses a metal rod that transfers the energy from the gas block to the bolt carrier. This isolates the receiver from the hot gas and fouling.

Does the Adams Arms piston upper have an adjustable gas system?

Yes, the Adams Arms piston upper features an adjustable gas block. This allows users to fine-tune the gas setting to match different ammunition types or muzzle devices, and a set screw is used to lock in the desired setting for optimal performance.

What are the potential downsides of an AR-15 piston system?

While generally reliable and cleaner, some piston systems can add a bit more weight to the front of the rifle. A minor critique mentioned for the Adams Arms system was the small size of the gas block's set screw, which could potentially be a point of failure if not properly secured or maintained.

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