The LMT Defense MARS-L SPECWAR 5.56 NATO 12.5" SBR Black (MIDMLK125-MARS) is a premium, professional-grade short-barreled rifle built to the highest military specifications. Manufactured by Lewis Machine & Tool (LMT Defense), this MARS-L SPECWAR model features a 12.5-inch barrel, monolithic upper receiver, and the renowned MARS-L ambidextrous controls. Designed for operators who demand exceptional reliability, accuracy, and durability in a compact package, this rifle is ideal for close-quarters battle, tactical applications, and professional use where performance cannot be compromised.
Why Choose the LMT Defense MARS-L SPECWAR?
LMT Defense has built a legendary reputation for producing some of the most reliable and battle-proven AR-15 platforms in the world. The MARS-L SPECWAR combines LMT’s signature monolithic upper receiver with their advanced MARS-L (Modular Ambidextrous Rifle System – Lightweight) lower receiver. This combination delivers superior strength, reduced weight, and true ambidextrous controls. The 12.5-inch barrel provides an excellent balance between maneuverability and ballistic performance in 5.56 NATO. Every component is manufactured in-house by LMT to exacting standards, ensuring consistent quality and long-term durability under extreme conditions. Whether used by military, law enforcement, or serious civilian shooters, the MARS-L SPECWAR represents one of the finest compact 5.56 rifles available today.
Key Features of the LMT Defense MARS-L SPECWAR 5.56 SBR (MIDMLK125-MARS)
- Monolithic Upper Receiver – One-piece forged upper for unmatched strength and consistent barrel alignment
- MARS-L Ambidextrous Controls – Fully ambidextrous safety selector, magazine release, and bolt catch
- 12.5-Inch Barrel – Compact barrel length optimized for close-quarters and maneuverability
- 5.56 NATO Chambering – Reliable and effective cartridge with widespread ammunition availability
- Lightweight Design – Engineered for reduced weight without sacrificing durability
- Enhanced Handguard – Full-length rail system for optics, lights, and accessories
- High-Quality BCG – LMT’s precision-manufactured bolt carrier group for maximum reliability
- Includes 30-Round Magazine – Comes with one 30-round magazine
- Matte Black Finish – Durable, non-reflective coating for tactical applications
Performance and Build Quality
The LMT Defense MARS-L SPECWAR is built to perform in the most demanding environments. The monolithic upper receiver eliminates the traditional upper/rail interface, resulting in a stronger, more rigid platform that maintains zero with mounted optics even under heavy use. The MARS-L lower receiver adds true ambidextrous functionality, making the rifle equally effective for both right- and left-handed shooters.
The 12.5-inch barrel provides excellent handling characteristics while still delivering effective terminal performance with 5.56 NATO ammunition. LMT’s attention to detail is evident in every component, from the precision-machined bolt carrier group to the high-quality barrel. This rifle is designed for professionals who require a compact, reliable, and accurate firearm that can withstand rigorous use. The combination of the monolithic upper, ambidextrous controls, and compact barrel length makes the MARS-L SPECWAR one of the most capable short-barreled rifles in its class.
Technical Specifications
| Product Name | LMT Defense MARS-L SPECWAR |
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| Model Number | MIDMLK125-MARS |
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| Caliber | 5.56 NATO |
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| Barrel Length | 12.5 inches |
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| Upper Receiver | Monolithic |
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| Lower Receiver | MARS-L Ambidextrous |
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| Magazine | 30-Round Magazine Included |
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| Finish | Matte Black |
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| UPC | 815415016931 |
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| Best For | Tactical Use, Close-Quarters, Professional Applications |
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Experience professional-grade performance in a compact 5.56 SBR.
LMT Defense MARS-L SPECWAR – Built to the highest military standards.
The LMT Defense MARS-L SPECWAR 5.56 NATO 12.5" SBR Black (MIDMLK125-MARS) is a premium short-barreled rifle featuring a monolithic upper receiver, MARS-L ambidextrous controls, and a 12.5-inch barrel. This model delivers exceptional reliability, accuracy, and durability in a compact package. The model number MIDMLK125-MARS and UPC 815415016931 identify this specific configuration. This is a National Firearms Act (NFA) item. Always ensure compliance with all applicable federal, state, and local laws regarding short-barreled rifles and firearm ownership.
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