The Sig Sauer MCX Rattler LT Pistol .300 AAC Blackout 6.75 in is a compact, semi-automatic platform built for shooters who need a short overall length and modularity without sacrificing reliability. Chambered in .300 AAC Blackout, this configuration pairs a cold hammer forged, threaded 6.75-inch barrel with a folding, pivoting contour brace for a compact footprint. Controls are ambidextrous, and the receiver includes a Picatinny rail for optics and accessories. The package includes one removable 30-round magazine and is finished in black anodize with polymer furniture.
Specifications
| Manufacturer | Sig Sauer |
|---|---|
| Model | MCX Rattler LT Pistol |
| Material | Aluminum receiver, cold hammer forged steel barrel, polymer furniture |
| Compatibility | .300 AAC Blackout ammunition (supersonic and subsonic); accepts standard AR-style triggers and grips |
| Finish | Black anodized receiver, black polymer furniture |
| Weight | 5.5 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- Cold Hammer Forged Barrel (6.75 in): This barrel is built to last—cold hammer forging increases durability and accuracy, so you get consistent shot placement even after hundreds of rounds. Great for training sessions with the family.
- Folding, Pivoting Contour Brace: The brace folds to the side, reducing the overall length for storage or transport. When deployed, it provides a stable shooting platform for better control.
- Ambidextrous Controls: The safety selector, magazine release, and bolt catch are all accessible from either side. This makes it easy for both right- and left-handed shooters to operate safely.
- Picatinny Rail Receiver: You can mount optics, lights, or lasers directly to the top rail without adapters. This keeps your setup simple and secure.
- .300 AAC Blackout Chamber: This round lets you shoot both supersonic and subsonic loads. Subsonic ammo is quieter with a suppressor, making it a good choice for home defense or range practice without disturbing neighbors.
Who It’s For
This pistol is for families, youth shooters, and beginners who want a compact, easy-to-handle firearm for home defense, truck carry, or the range. It’s also a solid choice for experienced shooters who need a lightweight, modular platform for close-quarters training. The .300 AAC Blackout chambering makes it versatile for both plinking and defensive use.
Pros & Cons
- Pros: Compact and lightweight; ambidextrous controls; reliable cold hammer forged barrel; accepts suppressors easily; folding brace for storage.
- Cons: Price point is higher than some entry-level AR pistols (around $2499.99), which may be a stretch for budget-conscious families. Also, .300 AAC Blackout ammo costs more than 5.56 NATO, so practice sessions add up.
Comparison
| Feature | Sig Sauer MCX Rattler LT | Zev Technologies OZ9 Combat | Agency Arms AOM-1 |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 9mm |
| Barrel Length | 6.75 in | 4.5 in | 5.0 in |
| Overall Length (folded) | ~16 in | ~7.5 in (pistol) | ~8.0 in (pistol) |
| Weight (unloaded) | 5.5 lbs | 1.8 lbs | 2.0 lbs |
| Brace Type | Folding, contour brace | None (pistol only) | None (pistol only) |
| Ambidextrous Controls | Yes | Yes | Yes |
| Price | $2499.99 | $1,899.99 | $2,199.99 |
The MCX Rattler LT offers a rifle-caliber option with a folding brace, making it more compact than the Zev or Agency pistols, which are handgun-caliber only. However, those alternatives are lighter and cheaper for beginners focused on 9mm.
FAQ
Is this firearm legal to own in my state?
Federal law allows this as a pistol with a brace, but some states have restrictions on barrel length or overall length for pistols. Check your local laws before purchasing. We ship to all 50 states, but compliance is your responsibility.
Can I shoot subsonic .300 AAC Blackout through this barrel?
Yes—the 6.75-inch barrel handles both supersonic and subsonic loads. Subsonic ammo is quieter with a suppressor, but always use a quality suppressor rated for .300 AAC Blackout to avoid damage.
Does this come with a suppressor?
No, the package includes the pistol, one 30-round magazine, and a folding brace. You can add a suppressor if your state allows and you have the proper tax stamp.
How do I clean and maintain the cold hammer forged barrel?
Clean it like any quality barrel: use a bore brush, solvent, and patches. Avoid over-oiling the chamber. Per Sig Sauer specs, the barrel is corrosion-resistant but still needs regular cleaning after range trips.
Trust & Delivery
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Last updated: April 2026
According to industry data, .300 AAC Blackout platforms account for over 12% of the pistol-caliber carbine market as of 2025, showing steady growth among shooters who value compact power.
Browse related categories: AR Pistols | .300 AAC Blackout | Firearm Accessories
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