Sig MPX K (Gen 3) Review

Published on August 7, 2020
Duration: 18:16

The Sig MPX K Gen 3 is a 9mm PCC with a reliable short-stroke gas piston system, praised for its excellent ambidextrous controls, flared magwell, and a high-quality Timney trigger. Despite a binding charging handle and handguard slop after 1,000 rounds, it demonstrated impressive reliability over 2,600 rounds and outperformed competitors in benchmarking drills, making it a top contender in the PCC market.

Quick Summary

The Sig MPX K Gen 3 utilizes a short-stroke gas piston system, offering a softer recoil impulse than blowback PCCs. It ran reliably for 2,600 rounds, though maintenance is key. Despite a binding charging handle and handguard slop, its ambidextrous controls and benchmarking performance make it a top PCC.

Chapters

  1. 01:35Intro: Sig MPX K Gen 3 Features
  2. 02:32The Bad: Charging Handle & Handguard Issues
  3. 05:35The Good: Controls & Modularity
  4. 07:36Reliability & Maintenance Over 2600 Rounds
  5. 08:58Trigger & Accuracy Test
  6. 10:51Shooting Impressions & Benchmarking

Frequently Asked Questions

What makes the Sig MPX K Gen 3's operating system unique?

The Sig MPX K Gen 3 features a short-stroke gas piston system. This design is distinct from the direct blowback systems common in many AR-9s and the CZ Scorpion, contributing to a softer recoil impulse and potentially improved reliability.

How reliable is the Sig MPX K Gen 3 after extensive use?

The MPX K Gen 3 demonstrated impressive reliability, cycling various ammo types for 2,600 rounds without cleaning. However, carbon buildup in the firing pin channel eventually caused failures, highlighting the importance of regular maintenance.

What are the main criticisms of the Sig MPX K Gen 3?

Reviewers noted issues with the charging handle being difficult to use and prone to binding. Additionally, significant handguard movement (slop) was observed after 1,000 rounds, possibly caused by the folding stock's interaction with the handguard.

How does the Sig MPX K Gen 3 perform in accuracy and benchmarking tests?

Accuracy at 25 yards was good with certain ammunition types. In benchmarking drills, the MPX K significantly outperformed the B&T TP9, leading reviewers to consider it the benchmark PCC on the market.

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