HK416 Clone Build: BRN-4 Upper + STS416 A1 Lower Tested
We built an HK416 clone using the Brownells BRN-4 upper and the STS416 A1 lower, then ran drills to see how the piston 5.56 carbine performs.
Brownells is renowned for its high-quality firearms and accessories, offering a range of products for enthusiasts, hunters, and competitive shooters. Trusted by gun owners worldwide, Brownells firearms are known for their precision, reliability, and performance. Whether you're looking for Brownells Retro rifles, shotguns, or handguns, Brownells provides firearms that are built to last. With a strong reputation in the industry, the Brownells Retro Series continues to be a popular choice among collectors and shooters alike.


Built for both professional and civilian shooters, Brownells firearms deliver exceptional accuracy and performance. Whether you're looking for a reliable rifle for long-range shooting or a shotgun for home defense, Brownells firearms provide consistent precision and smooth cycling, ensuring you never miss a shot when it matters most.

From the field to home defense, Brownells firearms offer unmatched versatility. The Retro Series brings classic designs to modern shooting, while Brownells rifles offer precision for tactical use. Whether you need a versatile shotgun, an all-around rifle, or a dependable handgun, Brownells firearms adapt to your needs, providing superior functionality and performance.

Brownells firearms are built from high-quality materials, designed to endure even the toughest conditions. Whether you're engaging in long-range competitions, hunting, or defending your home, these firearms maintain their accuracy and reliability. Brownells firearms are engineered to provide durability and exceptional performance over the long haul.






Founded in 1939, Brownells quickly gained recognition as a reliable source for high-quality firearms and firearm accessories. Over the decades, the company earned its reputation by offering precision-engineered products and exceptional customer service. Today, Brownells is a go-to name for shooters and gun enthusiasts worldwide.
The Brownells Retro Series, shotguns, and handguns are some of the most popular models. The Retro Series stands out for its nostalgic design combined with modern features, while Brownells shotguns and handguns are known for their reliability, performance, and versatility, making them top choices for hunting, defense, and competitive shooting.
For those looking for classic designs and modern performance, the Retro Rifles are a perfect fit. If you're interested in home defense or hunting, Brownells shotguns offer reliability and power. For personal defense or range shooting, Brownells handguns provide compact, dependable options.
Brownells firearms can be customized with various accessories like optics, upgraded stocks, magazines, and triggers. The Brownells Retro Series also offers specialized parts to enhance the vintage appeal and performance. Many models allow for additional personalization to meet your shooting style and needs.
Ensure your Brownells firearm is unloaded before cleaning. Use a solvent and brush to clean the bore, and apply lubricant to moving parts to prevent rust. Regular cleaning and maintenance will keep your firearm operating reliably and in top condition.
Brownells firearms come equipped with modern safety features, including manual safeties, drop safeties, and secure locking mechanisms. Always follow the basic rules of firearm safety, including keeping your muzzle pointed in a safe direction and ensuring the firearm is stored securely when not in use.
Brownells is renowned for its precision-engineered firearms and accessories, offering a wide range of products for hunters, competitive shooters, and enthusiasts. Known for their reliability and performance, Brownells firearms include top-quality rifles, shotguns, and handguns. Whether you’re seeking a tactical tool or a classic, the Brownells Retro Series delivers versatile options built to last and perform under any condition.
Stay informed with the latest news, expert reviews, and in-depth articles on firearms, shooting sports, and gun-related topics. Whether you’re a seasoned shooter or new to the world of firearms, our collection of articles will keep you updated on industry trends, product launches, and valuable tips for responsible gun ownership.

We built an HK416 clone using the Brownells BRN-4 upper and the STS416 A1 lower, then ran drills to see how the piston 5.56 carbine performs.

