The M4A1 Colt Block 1 SOPMOD Carbine with LMT 37mm Launcher merges the iconic design of the military-standard M4A1 with the versatility of a 37mm launcher, creating a piece that exemplifies military accuracy and historical significance for collectors and professionals alike. Built on the renowned Colt SOCOM 6920-SOCOM base, this setup replicates the exacting specifications of the Block 1 platform and adds an LMT (Lewis Machine & Tool) 37mm launcher for users who seek an authentic military-style configuration without the NFA restrictions of a 40mm launcher. This configuration is not just a rifle; it’s an authentic tribute to the SOPMOD (Special Operations Peculiar MODification) kits fielded by U.S. Special Operations Forces, offering a blend of history, engineering precision, and function for those who value military-grade craftsmanship.
Developed for elite units, the Block 1 SOPMOD was intended to equip war fighters with a modular and adaptable weapon system, capable of being customized with mission-specific attachments. This model pays homage to that goal by combining Colt’s SOCOM 6920—recognized for its exceptional durability and performance—with LMT’s well-regarded 37mm launcher, replicating the visual and practical design elements of the original 40mm military counterpart. For firearm enthusiasts, veterans, and military collectors, this carbine with an integrated 37mm launcher embodies the spirit and capability of the M4A1 that has seen service in global conflicts since the 1990s.
Traditional carbines offer reliability and adaptability, but often lack the true modularity and combat-readiness that the M4A1 Block 1 with SOPMOD enhancements delivers. The Block 1 SOPMOD configuration emerged to address the unique demands of modern warfare, allowing soldiers to operate effectively in a wide variety of combat scenarios with a single, adaptable platform.
With the addition of the LMT 37mm launcher, this setup goes beyond the capabilities of a standard rifle. The launcher’s presence adds versatility, allowing for training applications, non-lethal payloads, and a near-identical feel to a military 40mm system without the additional legal restrictions. The challenge has always been finding a configuration that adheres to military standards while remaining compliant for civilian ownership—a task this M4A1 Block 1 SOPMOD with LMT 37mm launcher achieves with precision.
The M4A1 Block 1 SOPMOD configuration, initially developed in the early 2000s, was one of the first programs aimed at modernizing small arms for Special Operations Forces by adding modularity to the M4 platform. The program’s goal was to provide operators with mission-specific options that could be quickly adapted in the field. This weapon setup recreates the modular Block 1 standard, a foundational build that continued to evolve but always prioritized adaptability and reliability under harsh conditions. The Colt M4A1 SOCOM rifle, chosen as the core of this configuration, represents the durable and reliable specifications that were eventually adopted for military SOCOM units, proving itself in environments ranging from arid deserts to dense urban areas.
LMT’s 37mm Launcher on this build is inspired by the M203 40mm launcher. While it mirrors the M203’s function and weight, the 37mm designation allows civilian use without needing the licensing associated with a true 40mm military launcher. Its design is nearly identical to the military version, providing a realistic option for collectors and enthusiasts who appreciate the aesthetics and functionality of a launcher attachment. The 12-inch barrel length on the LMT 37mm is also consistent with the military standard, furthering the authentic look and handling experience.
Barrel and Chamber Specifications on the Colt barrel mirror military demands with a 14.5-inch heavy SOCOM barrel, chrome lining, and a 1:7 twist rate. This twist rate is ideal for stabilizing heavier rounds, a choice that reflects the tactical needs of the M4A1 in various combat scenarios. Colt’s rigorous quality control and adherence to military specifications ensure that this carbine delivers reliable performance, whether for range use or display.
Handguard and Mounting System: Equipped with standard Picatinny rails, the rifle can be outfitted with additional SOPMOD Block 1 components, such as optics, vertical grips, lights, and laser systems, making it a practical choice for both static and dynamic applications. The quad-rail handguard provides optimal stability for mounting the LMT 37mm, distributing weight evenly to preserve the rifle’s balance—a vital consideration for accuracy and ease of use in tactical settings.
Control and Accuracy: With a 4.5 to 5.0 lb trigger pull, this rifle delivers controlled fire suitable for precision in rapid sequences, a characteristic that sets it apart for users who prioritize accuracy under high-stress conditions.
Whether it’s for duty training, historical collection, or simply the satisfaction of owning a replica closely aligned with military standards, this M4A1 Block 1 SOPMOD with LMT 37mm Launcher offers a rare balance of authenticity and functionality.
This M4A1 Block 1 SOPMOD configuration, paired with an LMT 37mm launcher, presents a significant piece of military history adapted for civilian ownership. Its high-quality construction and attention to authentic detail make it an invaluable addition for military collectors, tactical trainers, and firearm enthusiasts alike, providing not just a rifle, but a window into the history and adaptability of the U.S. Special Operations arsenal.
| Specification | Details |
|---|---|
| Rifle Base | Colt M4A1 Block 1 military style clone rifle |
| Caliber | 5.56 NATO |
| Upper Receiver | Colt factory receiver, CAGE Code marked, interior dry lube, factory BCG |
| Lower Receiver | Colt factory receiver, M4A1 "Property of US Government" laser engraved by factory with UID label |
| Barrel Length | 14.5" SOCOM, CMV, chrome-lined, 1:7 twist, pinned and welded |
| Overall Length | 32.5 inches (collapsed) |
| Handguard | Knights Armament M4 RAS Quad-rail Picatinny, SOPMOD Block 1 standard, with 3 11- rib rail covers |
| Launcher Type | LMT 37mm (simulates M203 40mm), fully functional |
| Launcher Barrel Length | 12 inches |
| Trigger Pull | 4.5-5.0 lbs Colt factory military trigger, or upgrade options available * |
| Sights | Front: Colt installed F height FSB, Rear: Matech 600m flip-up |
| Optics | None: You pick your optic to fit your clone rifle. |
| Muzzle Device | A2 extended flash hider, installed by Colt, pinned and welded to 16", with upgrade options available * |
| Stock | Adjustable stock, military-style M4 |
| Vertical Grip | mil spec M4A1 contract vertical grip (made by parent company of P&S Products, same as KAC) |
| Compatibility | SOPMOD accessories, compatible with Colt M4 series |
| Finish | Mil-Spec Hardcoat Anodized |
1) You may upgrade to a Surefire SOCOM muzzle device by adding the muzzle device. If you prefer a different muzzle device, pick an NT4 or any, and add the pin and weld revision service
2) You may upgrade your trigger to any trigger we carry, like a Geissele or LaRue trigger, and add to your cart and we will replace it for free (we will keep the Colt trigger)
