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Sig Sauer MCX Spear LT Semi-Auto 16" Barrel 5.56 30 Rounds Black
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
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SKU: RMCX-556N-16B-B-798681683321
Overview
Built for hunters and shooters who want a compact, configurable rifle platform, this semi-auto model pairs a 16-inch barrel with a short-stroke piston operating system for smooth cycling. The folding stock makes it easier to transport and store, while the M-LOK rail provides space for adding accessories to match the task at hand. Chambered in 5.56 NATO / .223 Rem and supplied with 30-round capacity, it suits range use, training, and general field carry where a lighter rifle is preferred. At 7.5 pounds, it offers a manageable balance of portability and capability without adding unnecessary bulk.
Why Hunters Choose the Sig Sauer
16-inch Cold
Hammer forged steel barrel for
Short-stroke Piston
Operating system supports semi-automatic function
Folding Stock
Allows easier transportation and storage
M-lok Rail
System supports accessory attachment
30-round Capacity
Extended shooting sessions
Key Features
- Sig Sauer MCX Spear LT semi-auto rifle in 5.56 NATO / .223 Rem caliber
- 16-inch cold hammer forged steel barrel
- Short stroke piston operating system for semi-automatic action
- 30-round capacity
- Folding stock for easier transport and storage
- M-LOK rail system for accessory attachment
Best Used For
- Hunters wanting a semi-auto rifle for range practice and familiarization with 5.56 NATO / .223 Rem.
- Users who value a folding stock for easier transport and storage between trips.
- Shooters planning to mount accessories on an M-LOK rail system.
- Those seeking a 16-inch, 30-round rifle setup for general-purpose use.
- Hunters who prefer a lighter 7.5-pound rifle for easier carry and handling.
Specifications
| Action | Semi-Auto |
|---|---|
| Barrel Length | 16" |
| Barrel Material | Cold Hammer Forged Steel |
| Blade Finish | Black |
| Caliber | 5.56 NATO / 223 Rem |
| Capacity | 30 rounds |
| Model | MCX Spear LT |
| Operating System | Short Stroke Piston |
| Rail | M-LOK |
| Stock Type | Folding |
| Threads | 1/2"-28 |
| Twist | 1:7 |
| Weight | 120 oz |
Pros
- 16-inch cold hammer forged steel barrel for durable construction
- Short-stroke piston operating system supports semi-automatic function
- Folding stock allows easier transportation and storage
- M-LOK rail system supports accessory attachment
- 30-round capacity provides extended shooting sessions
- 7.5-pound weight keeps the rifle relatively manageable
Considerations & Trade-offs
- The 16-inch barrel and 7.5 lb weight make this a full-size rifle rather than a compact setup, so it may be less convenient for tight transport or extended carry than shorter, lighter options.
- The folding stock improves storage and transport, but it also adds another moving component to consider when evaluating the rifle’s overall setup.
- The 30-round capacity is well suited to range use and general preparedness, but it may exceed magazine limits in some jurisdictions and hunting contexts.
- The M-LOK rail supports accessory mounting, but it also means the rifle may need additional setup before it matches a shooter’s preferred configuration.
Suggested Comparisons
- Semi-automatic 5.56 NATO / .223 Rem rifles
- Piston-driven AR-style rifles
- Folding-stock rifles
- M-LOK-equipped rifles
Suggested Accessories
- Rifle sling
- Optics mount
- Magazine pouch
- Cleaning kit
Frequently Asked Questions
What caliber does the Sig Sauer MCX Spear LT use?
This model is listed in 5.56 NATO / .223 Rem.
Is the MCX Spear LT a semi-automatic rifle?
Yes. The product is listed as a semi-auto rifle with a short stroke piston operating system.
What is the barrel length on this rifle?
The listed barrel length is 16 inches.
Does this rifle have a folding stock?
Yes. The long description states that it includes a folding stock for easier transportation and storage.
What accessory mounting system does it use?
It uses an M-LOK rail system, which allows accessories to be attached. The provided data does not list specific included accessories.