Stern Defense 4" Classic Upper 9mm 1:10 Free Float M-LOK Rail, Black

The free float M-LOK handguard from Stern Defense combines outstanding ergonomics with a lightweight yet durable design. Engineered for maximum versatility, this handguard is M-LOK compatible, allowing seamless integration with a wide range of attachments. Its secure clamp-on mounting system ensures it remains firmly in place, even under the most demanding conditions, including sustained full-auto fire and prone shooting from a bipod. Constructed from 6061 aircraft-grade aluminum and finished with a hard-coat anodization, it is built to withstand years of rugged use. Quick disconnect swivel holes add further adaptability, making this handguard an excellent choice for shooters who demand reliability and performance. Stern 9mm barrels provide firearm enthusiasts with a superior option for building a custom 9mm AR-15 upper group. Each barrel throat is precision-machined with an extended free bore to accommodate bullets with a longer ogive, preventing common defensive rounds from jamming into the rifling before full chambering. Many barrels on the market overlook this critical detail, leading to potential malfunctions that require manual clearing. Stern Defense barrels eliminate this risk, ensuring flawless performance and greater reliability in high-pressure situations. The Mil-Spec flat top upper receiver is built for strength and precision, featuring a Stern Defense laser-engraved dust cover and forward assist. Machined from 7075-T6 aluminum with a hard-coat anodized finish, it offers superior durability. The Mil-Spec AR-15 charging handle, engraved with the Stern Defense logo, is designed for effortless one-handed operation. Its ergonomic latch provides a firm grip, ensuring smooth and efficient charging even under stressful conditions. The Stern bolt assembly, crafted from 8620 AISI steel with a Mag-Phosphate finish, is engineered for compatibility with Mil-Spec and Glock-pattern upper receivers. Designed to function seamlessly with Colt SMG and Glock magazines, this bolt is also fully compatible with standard AR-15/M16 charging handles. It arrives fully assembled with all critical sub-components, including the firing pin, spring, retaining pin, extractor, extractor spring, proprietary center pin and roll pins. The enhanced bolt design accommodates single-stage triggers with short resets and is optimized for use with the JP Silent Capture Spring. Additionally, it supports the Law Tactical folding stock and Echo trigger, providing even more versatility for custom builds. For those seeking to control muzzle blast effectively, Stern Defense offers a purpose-built blast director. This component directs muzzle gases away from the shooter, making it especially beneficial for short-barreled rifles and pistols. Precision-machined from 6061 aircraft-grade aluminum billet and hard-coat anodized for longevity, this blast director measures 1.75 inches in length and 1.20 inches in diameter. Stern Defense continues to set the standard in quality, innovation and performance, delivering superior firearm components that enhance every shooting experience. Hard coat anodized 6061 aircraft-grade aluminum handguard offers exceptional durability and corrosion-resistance The sturdy handguard is built to withstand tough conditions while maintaining lightweight functionality A lightweight handguard offers durability while maintaining maneuverability A 4 inches handguard ensures a compact, lightweight addition to the firearm The smallest inside diameter of the handguard measures 1.435 inches, ensuring a precise fit Barrel length is measured in overall length from breech to muzzle, ensuring compliance with legal and performance standards 4 inches barrel offers a balance between concealability and accuracy for compact firearms The barrel is threaded at 1/2-36 for compatibility with a variety of muzzle accessories A 1:10 twist rate stabilizes a wide range of bullet weights, optimizing accuracy and ballistic performance The Melonite coating offers superior durability and corrosion-resistance, significantly enhancing the longevity and performance of the barrel by providing a hard, protective surface The sturdy construction is achieved with hard coat anodized 7075-T6 aluminum for a highly durable receiver A laser-engraved charging handle enhances grip and durability The sturdy construction utilizes hard coat anodized 6061 aircraft-grade aluminum for a robust and durable charging handle Manufactured using 8620 AISI steel for a strong and resilient bolt The custom 4140 billet extractor ensures superior ejection performance Glock cut ensures compatibility with Glock-style slides The mag-phosphate coating on the bolt provides superior corrosion-resistance, ensuring long lasting durability and performance, even in harsh environments A 15.50 oz bolt delivers durability and smooth cycling for consistent and reliable function Optimized for single-stage short reset triggers to improve response time Works with both the law folding tactical stock and the echo trigger for maximum customization Designed to work with the JP silent capture spring (not recommended for .45 ACP) The sturdy construction incorporates hard coat anodized 6061 aircraft-grade aluminum for a resilient blast can Lightweight construction ensures the blast can provides effective performance without adding bulk Manufactured in the USA with precision and care for superior reliability