Guide

    Ohio Ordnance Works M240-SLR (7.62 NATO) + 2,500 M13 Links: Specs, Features, and Real-World Use

    Ohio Ordnance Works M240-SLR (7.62 NATO) + 2,500 M13 Links: Specs, Features, and Real-World Use

    Introduction

    The Ohio Ordnance Works M240-SLR is one of the most distinctive semi-automatic rifles on the civilian market: a belt-fed, 7.62 NATO/.308 Win platform built to deliver the look, handling, and durability cues of the military M240 family—while operating as a closed-bolt, semi-automatic-only system. For buyers who want a premium, range-dominant, “crew-served feel” rifle with serious engineering behind it, this is a category-defining option.

    This specific package—Ohio Ordnance Works M240-SLR 7.62 NATO + 2,500 M13 Links—adds immediate value for owners who want to actually run the gun as intended. Belts and links are the practical “magazines” of a belt-fed; having 2,500 M13 disintegrating links on hand streamlines loading and keeps downtime low.

    Key Features and Specifications

    Below are the most relevant, buyer-focused technical details for the Ohio Ordnance Works M240-SLR, emphasizing what matters in real use.

    Operating system and design intent

    • Action type: Gas-operated, semi-automatic centerfire rifle.
    • Closed-bolt operation (semi-auto conversion): The M240 family is traditionally open-bolt in military configuration. The semi-auto-only design uses a redesigned fire-control system intended to prevent installation of full-auto components and to enable closed-bolt function.
    • Receiver/sideplate changes for semi-auto compliance: The semi-auto receiver architecture incorporates dimensional changes (notably on the receiver/sideplate component that is considered the receiver) to prevent compatibility with certain military full-auto parts.

    Why it matters: Closed-bolt semi-auto operation can feel more “rifle-like” to many shooters, and a purpose-engineered semi-auto design is generally preferable to improvised conversions when you’re investing at this level.

    Caliber, feeding, and links

    • Chambering: 7.62×51mm NATO and typically compatible with .308 Winchester (ammunition selection should always follow the manufacturer’s guidance).
    • Feed system: M13 disintegrating links.
    • Included in this package: 2,500 M13 links.

    Why it matters: M13 links are a widely standardized format for 7.62 NATO belt-fed systems. For owners, links translate directly into time on the gun—especially when you’re building belts for classes, events, or long range days.

    Barrel and handling characteristics

    • Barrel length: 20 inches.
    • Quick-change barrel capability: The platform architecture supports rapid barrel removal/installation using the side release mechanism typical of the M240 pattern.

    Why it matters: The 20" barrel length is a strong “do everything” choice for 7.62 NATO: it provides solid velocity potential, practical accuracy, and a balanced feel on a bipod—without pushing the rifle into an unwieldy overall length.

    Dimensions and weight

    • Overall length: 47 5/8 inches.
    • Weight: Approximately 24 lb 6 oz.

    Why it matters: This is not a lightweight rifle—and it’s not trying to be. The mass is a feature for many use cases, helping stabilize the gun on support and making recoil impulse feel notably manageable for the cartridge.

    Sights, rails, and optics readiness

    • Iron sights: Front blade and rear ladder-style system (pattern-typical), with a receiver/top cover arrangement that supports optic mounting.
    • Top cover rail: M1913/Picatinny rail section on the top cover for optics.

    Why it matters: A belt-fed that can realistically support modern optics (LPVO, prism, red dot + magnifier, or a mid-power scope) is far more usable. The optic-ready top cover helps turn “cool” into “capable.”

    Trigger and controls

    • Trigger: Two-stage design (semi-auto fire-control), with a safety integrated into the pistol grip area.

    Why it matters: The trigger system is a core part of what separates a purpose-built semi-auto belt-fed from a novelty. Practical semi-auto controllability improves hit potential, especially when shooting from bipod or tripod support.

    What “+ 2,500 links” really means

    M13 links are disintegrating: as the gun cycles, links separate and eject as individual pieces. That’s normal. In practice:

    • Links are often treated as semi-consumables in hard use.
    • Many shooters do collect and reuse links, but inspection (bending, wear, corrosion, retention tension) is important.

    Having 2,500 links gives you breathing room to:

    • Build multiple belts for different loads (ball/tracer substitutes where legal, match ammo for accuracy sessions, etc.).
    • Keep pre-linked ammo ready for events.
    • Maintain a stash while you learn what link condition your specific gun “likes.”

    Practical Applications

    The Ohio Ordnance Works M240-SLR shines in roles where stability, durability, and a belt-fed manual of arms are advantages rather than burdens.

    1) Premium range and event gun

    If your goal is an unforgettable shooting experience with authentic belt-fed handling, this platform delivers. The weight and overall system geometry tend to make 7.62 NATO feel very controllable from supported positions.

    2) Supported-marksmanship platform (bipod/tripod)

    With appropriate support gear, the Ohio Ordnance Works M240-SLR becomes a very stable semi-auto 7.62 system for:

    • Distance steel
    • Practical accuracy drills
    • Slow-fire group work with quality .308/7.62 loads

    3) Collector-grade “civilian legal” analog to the M240 pattern

    Transferable machine guns are scarce and priced beyond most buyers. A high-quality semi-auto belt-fed can be a compelling alternative for collectors who value:

    • Correct manual of arms
    • Robust construction
    • The belt-fed ecosystem (links, trays, top cover, barrel changes)

    4) Training value (manual of arms)

    While it is not a substitute for military issue training, a semi-auto belt-fed still teaches useful discipline:

    • Feeding/loading procedures
    • Belt management and staging
    • Heat management and schedule control
    • Maintenance habits that matter on larger, more complex systems

    Expert Analysis

    The core value proposition of the Ohio Ordnance Works M240-SLR is that it’s not just “a rifle that happens to be belt-fed.” It is an engineered system meant to be run hard—within the realities of semi-auto operation.

    Strengths

    • Serious mechanical pedigree: The M240 pattern is widely respected for reliability and durability, and the semi-auto version aims to preserve the external handling and feed system while meeting legal/functional constraints.
    • Mass as a performance feature: The 24+ lb weight is a major reason the gun can feel so flat and steady in supported fire.
    • M13 link ecosystem: Widely standardized links and broad user familiarity make ownership simpler than obscure, proprietary belt formats.
    • Optics-capable top cover: Modernizing a belt-fed for real use almost always involves optics, and the rail arrangement supports that.

    Considerations before buying

    • State restrictions and shipping realities: Belt-fed rifles are specifically restricted in some jurisdictions, and manufacturer shipping policies can be stricter than baseline legal requirements. Always verify your local legality and transfer pathway through your FFL before committing.
    • Logistics are part of the lifestyle: Belt-fed ownership means you’ll manage links, ammo staging, and cleaning at a higher intensity than box-mag rifles.
    • Wear items and spares planning: High round count use benefits from a proactive spares plan (springs, small pins, consumables). Even when not strictly required, it reduces downtime.

    Setup recommendations (practical, non-brand-specific)

    • Optic: A rugged red dot or prism for 0–300, or a quality LPVO/mid-power scope if you want to explore the platform’s accuracy potential.
    • Support: A stable bipod and/or a tripod mount solution if your use includes extended strings or precision-oriented shooting.
    • Ammo strategy: Start with known, consistent 7.62 NATO or .308 loads; avoid chasing “mystery surplus” until you’ve confirmed function with your baseline.

    Conclusion

    The Ohio Ordnance Works M240-SLR is a flagship semi-automatic belt-fed rifle: heavy, durable, and built for shooters who want the authentic belt-fed experience in 7.62 NATO/.308 without the barriers of NFA transferable machine guns.

    This package—Ohio Ordnance Works M240-SLR 7.62 NATO + 2,500 M13 Links—is especially appealing because it supports the real-world side of ownership. Links are the heartbeat of a belt-fed, and starting with 2,500 M13 links helps you spend more time shooting and less time scrambling for belt components.

    Sources

    Ohio Ordnance Works. "Shipping Restrictions." Ohio Ordnance Works. (accessed 2026). https://www.ohioordnanceworks.com/shipping-restrictions/

    NRA Staff. "Ohio Ordnance Works M240 SLR." American Rifleman. April 14, 2011. https://www.americanrifleman.org/content/ohio-ordnance-works-m240-slr/

    GlobalSpec. "ARMY - MIL-DTL-45403E (3) CONT. DIST. - Link, Cartridge, Metallic Belt, 7.62 Millimeter - M13." GlobalSpec. June 23, 2021. https://standards.globalspec.com/std/14461370/mil-dtl-45403e-3-cont-dist/

    Wikipedia. "M13 link." Wikipedia. (accessed 2026). https://en.wikipedia.org/wiki/M13_link