Sig Sauer AIRMPX177G2BLK CO2-Powered .177 Caliber Air Rifle

The Sig Sauer MPX GEN II is a CO2-powered .177 caliber air rifle built on a proven platform and refined for better accuracy and handling. If you're looking for a semi-automatic air rifle that delivers consistent performance on the range or in the backyard, this is a modern tactical-style shooter that combines Sig's reputation for quality with practical features you'll actually use. The Gen II updates—a redesigned buttstock, improved controls, and an M-LOK handguard—make this feel more like a true rifle, not just a pellet gun.

Fed by a 30-round magazine and powered by 88g or 90g CO2 cartridges housed in the quick-detach buttstock, the MPX Gen II delivers up to 450 fps with pellets in the 5.0–8.5 grain range. That's reliable velocity for target work and small-game airgun hunting. The rifled barrel supports accuracy, while the dual-aperture flip-up peep sights get you on target without batteries or mounting rings. A 7-pound trigger and ambidextrous manual safety levers round out the shooter-friendly design. At 25.75 inches overall and 6.2 pounds unloaded, it balances pointability with control.

The M-LOK handguard accepts standard accessories, and the Picatinny rail lets you add optics if the iron sights don't suit your needs. This is an air rifle for shooters who want semi-automatic firepower, a modern ergonomic platform, and the reliability to trust it for regular use—whether you're developing marksmanship, training, or just enjoying trigger time without centerfire noise and recoil.

Key Features

• Semi-automatic .177 pellet rifle with 30-round magazine capacity
• CO2-powered (88g or 90g cartridges housed in quick-detach buttstock)
• Dual-aperture flip-up peep sights adjustable for windage and elevation
• Rifled barrel for improved accuracy
• M-LOK handguard for accessory mounting
• Ambidextrous manual safety levers
• Modern tactical ergonomics: redesigned buttstock, reduced-angle grip, low-profile recoil pad
• Picatinny rail for optics and accessories

Specifications

Frequently Asked Questions

What comes in the box with the MPX Gen II?

The rifle ships with one 30-round pellet magazine. You'll need to supply your own 88g or 90g CO2 cartridges.

Can I mount a scope or red dot on this air rifle?

Yes. The Picatinny rail supports standard optics mounts. The flip-up sights fold down if you want to run a scope, and the M-LOK handguard accepts compatible accessories as well.

What pellet weights should I use?

The MPX Gen II is optimized for pellets between 5.0 and 8.5 grains. Staying within this range will give you the best accuracy and performance.

Is the MPX Gen II suitable for hunting small game?

At up to 450 fps with the right pellet, this .177 air rifle is viable for small-game hunting where legal. Check your local regulations—some areas restrict air rifle use for certain game or require specific energy thresholds.