The AR-18 never gained a household reputation like the AK-47 or AR-15, but its impact goes deeper than most individuals appreciate. Behind the scenes, it influenced the DNA of some of the most sophisticated rifles employed by contemporary militaries and police forces. Developed around the principles of low-cost manufacturing, interchangeable components, and a short-stroke gas piston system, the AR-18 moved rifle design forward in manners unappreciated at the time. Decades later, its influence can be seen in some of the most reliable firearms in the world. The following ten rifles can trace much of their engineering to the AR-18.
10. SIG MCX
The SIG MCX is sleek, modern, and endlessly adaptable. But peel back its layers and you’ll find a lot of AR-18 inside. Dual recoil springs, a rotating bolt head, and a short-stroke piston setup make it a direct descendant. Special operations teams rely on it because it’s reliable in the worst conditions—a trait the AR-18 was known for from the beginning.
9. FN SCAR
The SCAR may turn heads with its appearance, but at its heart is pure AR-18. Its piston setup, modular construction, and tough build all come directly from that original playbook. The fact that it was a favorite of NATO service attests to how far the AR-18’s design concepts have run with the times in current warfare.
8. HK433
Consider the HK433 to be a combination of lessons taken. It’s borrowed from both the G36 and the HK416, but its internal design rests on the AR-18. It has ambidextrous controls, a monolithic upper, and a piston-driven carrier group that make it a sleek, new rifle. It’s state-of-the-art but firmly founded on the same philosophies that put the AR-18 on the cutting edge.
7. CZ BREN 2
The BREN 2 continues the AR-18’s legacy of ruggedness. Its short-stroke gas piston mechanism and extremely versatile configuration make it ideal for troops operating in harsh conditions. Practical, dependable, and durable, it’s no wonder that this rifle has gained popularity among a number of European militaries.
6. Steyr AUG
The AUG is immediately recognizable as a fuselage-shaped bullpup, but behind its high-tech exterior are mechanisms traceable to the AR-18. The bolt carrier and gas system configurations mirror their ancestors’ design, although they may look totally different on the surface. It’s a perfect illustration of how a concept could be reformed to create something new.
5. SA80 (L85)
The British SA80 was bumpy to begin with, but the root of its design is AR-18 all the way. Its bolt, carrier, and stamped design are all sourced from that initial foundation. Even though the SA80 was significantly reworked to correct early issues, its roots illustrate how the AR-18’s design could be modified—even if the implementation wasn’t flawless.
4. HK G36
Light, modular, and constructed of polymer parts, the G36 was intended for the contemporary battlefield. Its piston-operated mechanism and internal design echo the AR-18’s designer philosophy. Adopted globally by military and police forces, the G36 demonstrates the reach of AR-18’s influence far beyond its original timeframe.
3. Howa Type 20
To Howa, the AR-18 is part of its heritage. The company used to manufacture AR-18s under license, and the Type 20 is its continuation. Adjustable and folding stocks, enhanced rails, and polymer build make it contemporary, but the gas system and internal design still retain the AR-18’s DNA.
2. FB MSBS Grot
The Polish MSBS Grot is taking flexibility to a new level in that one can switch between bullpup and standard configurations with the same basic system. Its piston action and module-based architecture reflect the same design ethos that AR-18 first implemented. It’s a testament to the fact that those concepts are still relevant for rifles being constructed today.
1. HK416
The HK416 may be the most famous rifle with AR-18 roots. Built to improve on the shortcomings of direct impingement systems, it uses a short-stroke piston almost identical in concept to the AR-18. It’s been battle-tested by elite units and has earned a legendary reputation. That its design traces back to the AR-18 says everything about the original’s lasting impact.
While the AR-18 was not successful during its own time, it left something much more significant behind: a blueprint for design that changed the future of rifles. Its toughness, simplicity, and advanced engineering continue on in tools carried by some of the world’s toughest professionals. Subtly but undeniably, the AR-18 altered the direction of contemporary firearm design.