SIG MPX GEN 1 for Sale
Browse Sig mpx gen 1 listings from verified sellers across the U.S. on GunsAmerica.
Quick Look
The Sig MPX Gen 1 was introduced by SIG Sauer as a modular, blowback-operated subgun for the civilian and law enforcement markets. Built around an innovative short-stroke gas piston system, it offers reduced recoil and rapid-fire control. Though no longer in production, the Gen 1 remains a niche favorite for collectors and PCC competitors seeking its early features and unique aesthetics.
Why It's a Top Choice
- Monolithic upper with integrated rail system
- Short-stroke gas piston for cleaner operation
- AR-style controls for familiar ergonomics
- High aftermarket support for stocks and triggers
- Reliable performance in suppressed configurations
Key Variants
Sig MPX Gen 2
Features redesigned internals and compatibility with more M-LOK handguards and barrel lengths for modern users.
Sig MPX K
Compact with a 4.5-inch barrel, ideal for concealed carry or maneuverability in tight environments.
Sig MPX Copperhead
Ultra-compact PDW with integrated upper and barrel shroud for discreet carry and home defense.
Competitor Comparison Table
| Feature | Sig Mpx Gen 1 | CZ Scorpion Evo 3 | B&T APC9 |
|---|---|---|---|
| MSRP | $1,300 | $850 | $2,000+ |
| Capacity/Size | 30+1, carbine/PCC | 30+1, carbine | 30+1, compact/subgun |
| Weight | 6.1 lbs | 6.1 lbs | 5.5 lbs |
| Optics-Ready | Yes, full-length rail | Yes | Yes |
| Trigger Type | Mil-spec AR trigger | Proprietary | Match-grade |
| Notable Pro | AR ergonomics and modularity | Affordable and simple to service | Swiss machining and precision |
| Notable Con | Limited Gen 1 parts support | Harder recoil impulse | High price point |
Best Use Cases
- Range practice and plinking
- Pistol caliber carbine competition
- Home defense setup
- Firearms collecting
- Tactical weapons training
FAQs
Can I still buy parts for the Sig MPX Gen 1?
Yes, but parts are limited. Some components are Gen 1 specific and no longer in active production.
What is the difference between MPX Gen 1 and Gen 2?
Gen 2 models have redesigned bolts, handguard mounts, and broader accessory compatibility.
How does the MPX Gen 1 perform suppressed?
The gas piston system makes it highly reliable and clean-running with most 9mm suppressors.
Prefer nearby results? Toggle to search local listings.
Sig Sauer MPX 9mm Carbine--Used
$1,599.99
Sig Sauer MPX K (PMPX-4B-9-35)
$2,179.99
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