Update, October 9, 2026: ATF no longer requires a Form 4, tax stamp, fingerprints or registration for suppressors, short-barreled rifles, short-barreled shotguns or AOWs. They now transfer on a standard Form 4473 with a background check. Anything below that mentions a Form 4, a wait or a tax stamp was written before this change. What changed
The Sig Sauer MPX 9mm short barrel rifle delivers exceptional performance in a compact, versatile platform built for modern shooters. This semi-automatic rifle features a 4.5″ barrel and 35-round magazine capacity, making it perfect for hearing-safe hunting, range sessions, and home defense scenarios.
Additionally, the MPX’s folding stock design enhances portability without sacrificing stability. Furthermore, the matte black finish resists corrosion and maintains a professional appearance. The 9mm caliber offers manageable recoil and ammunition availability. Therefore, this rifle suits both experienced shooters and those new to short barrel platforms.
Key Features & Specifications
The Sig Sauer MPX combines proven engineering with practical design. Its 4.5″ barrel delivers consistent accuracy at typical defensive distances. Moreover, the 35-round capacity ensures sustained fire for training or defensive use. The semi-automatic action provides reliable cycling with quality ammunition.
Ideal Use Cases
This short barrel rifle excels in hearing protection scenarios at the range where noise reduction matters. Additionally, the compact profile makes it suitable for home defense applications. Furthermore, the MPX’s 9mm chambering provides an excellent balance of power and control for shooters seeking a modern, effective platform.
Whether you’re a competitive shooter, home defense enthusiast, or someone who values hearing protection, the MPX delivers performance you can trust. Indeed, Sig Sauer’s reputation for quality ensures this rifle will serve you reliably for years.
Ordering from Western Sport
Order online and we ship it to the licensed FFL dealer you choose near you — see how buying a gun online works. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: What is included with the MPX purchase?
A: The Sig Sauer MPX comes with one 35-round magazine. You may purchase additional magazines separately to expand your capacity options.
Q: How does the folding stock work on the MPX?
A: The folding stock reduces the rifle’s length for storage and transport. It folds securely and locks into position for shooting, maintaining stability and control.
Q: What are the best use cases for a 9mm short barrel rifle?
A: The MPX excels for hearing protection at the range, home defense scenarios, and hearing-safe hunting applications. The 9mm caliber offers manageable recoil and ammunition availability for regular training.
This item is out of stock. These are on the shelf today and ship or transfer the same way. Not sure which is the right swap? Call 817-393-4000 and we will tell you straight.
Reviews
There are no reviews yet.