Sig MPX K (Gen 3) Review

Published on August 7, 2020
Duration: 18:16

This review of the Sig MPX K (Gen 3) highlights its performance in a high-round-count test (2,600+ rounds). While praised for its soft recoil, excellent controls, and modularity, the review points out issues with the charging handle and handguard slop after extended use. Reliability was generally good, but carbon buildup in the firing pin channel necessitated adherence to the manufacturer's cleaning schedule.

Quick Summary

The Sig MPX K (Gen 3) is a 9mm PCC praised for its soft recoil, excellent ambidextrous controls, and modularity, featuring a Timney trigger. However, it can suffer from a difficult charging handle and handguard slop after extensive use. Reliability is generally high over 2,600+ rounds, provided the firing pin channel is kept clean per the manual's schedule.

Chapters

  1. 01:35Introduction to Sig MPX K Gen 3
  2. 02:32The Bad: Charging Handle and Handguard
  3. 05:35The Good: Controls and Modularity
  4. 07:36Reliability and Maintenance
  5. 08:58Trigger and Accuracy
  6. 10:51Shooting Impressions and Benchmarking

Frequently Asked Questions

What are the key features of the Sig MPX K (Gen 3)?

The Sig MPX K (Gen 3) features a short-stroke gas piston system, M-LOK handguard, a Timney single-stage trigger, ambidextrous controls, and a flared magwell for easy reloads. It also has a 1913 rear rail for stock options.

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

The firearm cycled reliably for over 2,600 rounds without cleaning. However, carbon buildup in the firing pin channel eventually caused failures, highlighting the importance of following the manufacturer's recommended cleaning schedule.

What were the main criticisms of the Sig MPX K (Gen 3)?

Reviewers noted issues with the charging handle being difficult to manipulate and prone to locking up. Significant handguard movement (slop) was also observed after 1,000 rounds, possibly due to the folding stock's interference.

How does the Sig MPX K (Gen 3) perform in terms of recoil and accuracy?

It exhibits a very soft recoil impulse compared to blowback PCCs. Accuracy testing at 25 yards yielded tight groups with certain ammunition types, making it a strong contender in its class.

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