Sick Builds: SIG SAUER MPX-k – Compact. Modern. Precise.
What is the SIG MPX-k?
The MPX-k is a compact submachine gun chambered in 9x19 mm caliber. It's the smaller brother of the MCX —Sig Sauer's .223/300 Blackout platform—and was first introduced in 2013. It gained notoriety when the US Secret Service adopted the system in 2019 .
The MPX-k is available as a semi-automatic platform and offers modern features that make it a serious alternative to the MP5 or CZ Scorpion.
Why this configuration?
We're constantly getting questions like: "What kind of weapon is that?" , "How did you build it?" or "Why exactly like that?" That's exactly what Sick Builds is for - to explain the why behind the setup .
Each configuration serves a specific purpose. In this case, it's a compact, precise, and modern platform for CQB and dynamic operational scenarios.
Comparison & Classification
The MPX-k plays in the same league as:
- HK MP5
- CZ Scorpion Evo 3
- B&T APC9
However, it offers a more modular design , modern ergonomics, and the possibility of individual configuration. Important to note: This is a semi-automatic civilian version , not a fully automatic model.
Conclusion
The SIG SAUER MPX-k is an impressive weapon system with a wide range of applications – from training to duty to EDC. Those who value modern technology, precision, and compactness will find a top platform here.
Sick Builds means understanding, not just marveling. Stay tuned for more builds and details.

