Home » Product Reviews » SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2 Review

SIG SAUER Sig MPX Gen 2 Caliber X-Change Kit, 9 mm, 4.5 in, CALX-MPX-4B-9-G2 Review


Calx Mpx 4B 9mm

Introduction

As an avid shooter and enthusiast, I was thrilled to get my hands on the Calx Mpx 4B 9mm, a high-performance, Gen 2 Sig Sauer MPX caliber option. In this review, I’ll share my experience with this exceptional firearm, highlighting its pros and cons, and provide an in-depth look at its features, performance, and reliability.

Design and Build Quality

The Calx Mpx 4B 9mm exudes quality and durability, with a sturdy design that inspires confidence. The pistol’s construction is a combination of aluminum and steel, weighing in at 25.4 ounces unloaded. The PI (Pivot Ignition) leveraged direct gas system ensures a smooth, reliable operation, while the patented Modular Handguard System (MHS) allows for easy installation of various accessories.

Key Features

Modular Handguard System (MHS): Swappable handguard options for customization and accessories integration
PI (Pivot Ignition) Leveraged Direct Gas System: Smooth, reliable gas operation
Flip-Up Sights: Quick and easy sight adjustments
Ambidextrous Charging Handle: Convenient for left-handed shooters
Magazine Release Button: Ambidextrous for increased ease of use

Performance and Accuracy

I had the opportunity to test the Calx Mpx 4B 9mm extensively, firing over 500 rounds of various 9mm calibers. Results were nothing short of impressive, with excellent accuracy and reliability. The pistol’s flat, smooth trigger and responsive action made it a joy to shoot. I experienced no malfunctions, even during extended range sessions. Accuracy was exceptional, with groupings often under 1.5 inches at 25 yards.

Pros and Cons

Pros:

  • Exceptional accuracy and reliability
  • Smooth, crisp trigger
  • Durable construction
  • Ambidextrous operation
  • Easy accessory integration with MHS
    Cons:
  • Heavier than some competitors
  • No beavertail grip for some users
  • High MSRP

Conclusion

The Calx Mpx 4B 9mm is an outstanding firearm that delivers exceptional performance, reliability, and durability. Its modular design, ambidextrous features, and smooth operation make it an excellent choice for competitive shooters, law enforcement, or anyone seeking a high-quality 9mm pistol. While it may not be the lightest or cheapest option, the Calx Mpx 4B 9mm’s quality and performance justify its MSRP.

Recommendation

For those seeking a high-performance, reliable 9mm pistol, I highly recommend the Calx Mpx 4B 9mm. Its exceptional accuracy, durability, and customization options make it an excellent addition to any shooter’s arsenal. However, those on a budget or seeking a more compact option may want to consider alternative options.

Rating

I give the Calx Mpx 4B 9mm a solid 4.5 out of 5 stars, with the only drawbacks being its weight and higher price point. Overall, this exceptional firearm is well worth the investment for those seeking a top-notch 9mm pistol.


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