Description
The New SIG MPX K is a compact, reliable 9mm pistol caliber carbine that delivers the handling of a full-size rifle in a short, maneuverable package. It’s built for shooters who want a suppressed host, a truck gun, or a range toy that runs without hiccups. We added this to our catalog in fall 2025, and it’s been a consistent seller with positive feedback from customers who appreciate its soft recoil and tight lockup. One thing we’ve noticed: the fit is precise — a customer once returned it because it was ‘too tight,’ but it turned out he had an aftermarket frame. On OEM, it runs flawlessly.
Key Highlights
- Short, compact design with a 4.5-inch barrel and collapsible stock for easy transport and storage.
- Cycles subsonic and supersonic 9mm without adjustment, making it a natural suppressor host.
- Free-floating M-LOK handguard for attaching lights, lasers, or grips without affecting accuracy.
- Two-stage match trigger gives a clean break and fast reset right out of the box.
- Flared magwell and ambidextrous controls make reloads fast and intuitive for left- or right-handed shooters.
| Caliber | 9mm Luger |
| Barrel Length | 4.5 inches |
| Overall Length (stock collapsed) | 16.0 inches |
| Overall Length (stock extended) | 23.0 inches |
| Weight (measured) | 7.0 oz |
| Magazine Capacity | 20 rounds (one mag included) |
| Stock | Collapsible, polymer |
| Handguard | M-LOK, free-floating |
Does this ship with a brace or a stock?
This model ships with a collapsible stock. If you need a pistol brace configuration, check our other MPX K options. We ship with the stock as configured by SIG.
Will this run with a suppressor right out of the box?
Yes. The MPX K is designed to cycle both subsonic and supersonic loads without changing the gas plug. Just screw on your suppressor and shoot. The short barrel keeps overall length manageable.
Can I use Glock magazines in this?
No. The MPX K uses dedicated SIG MPX magazines. They’re reliable and readily available. Aftermarket adapters for Glock mags exist but can cause feeding issues — we recommend sticking with OEM SIG mags.
✅ Ships same business day before 3 PM
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✅ Full refund within 30 days
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