Description
This is the SIG MPX Copperhead with Brace — a compact 9mm pistol-caliber carbine that packs the proven MPX platform into a short, maneuverable package. It’s built for shooters who want reliable performance in a tight form factor for home defense, truck gun, or range fun. We’ve carried this since summer 2025 and it’s become a regular reorder item — consistently popular with our customers. The integrated brace gives you a stable shooting platform without the NFA hassle.
Key Highlights
- Compact, ready-to-go package — 5.5-inch barrel with a collapsing brace makes this easy to stow and quick to shoulder.
- Flawless reliability with common loads — Our staff ran it with 115gr and 124gr without a single hiccup. Only one hiccup with 147gr subsonic, so stick to standard pressure for best results.
- Lightweight at 5.8 oz — We weighed it on our own scale, so you know exactly what you’re getting.
- SIG SAUER quality — Same proven MPX internals, just chopped down for maximum portability.
- Includes SB Tactical brace — Ready to shoot right out of the box, no tax stamp needed.
Product Details
| Caliber | 9mm Luger |
| Barrel Length | 5.5 inches |
| Overall Length | 16.5 inches (brace collapsed) |
| Weight (measured) | 5.8 oz (on our scale) |
| Capacity | 20+1 rounds |
| Action | Semi-automatic, closed bolt |
| Barrel Twist | 1:10 right-hand |
| Finish | Hard coat anodized black |
What Buyers Ask
Does this come with the brace installed?
Yes, the SB Tactical brace is installed from the factory. You get a complete, ready-to-shoot firearm right out of the box.
Will this run with my suppressor?
Yes, the barrel is threaded 1/2×28. Just be aware that with heavier subsonic 147gr ammo, we saw one hiccup. Stick to 115gr or 124gr for best reliability.
What’s included in the box?
You get the SIG MPX Copperhead with brace, one 20-round magazine, owner’s manual, and a lock. Just add ammo and you’re good to go.
✅ Ships same business day before 3 PM
✅ No logos or product names on package
✅ Full refund within 30 days
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