Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver – Premium Short Barrel Upper
The Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver (121435) is a factory-assembled, high-performance upper receiver designed for the renowned SR-15 platform. Featuring a 13.7-inch barrel and a modern M-LOK handguard, this complete upper offers exceptional reliability, accuracy, and maneuverability in a compact package. Built to the same rigorous standards trusted by elite military and law enforcement units, the SR-15 KS-1 upper receiver provides a premium foundation for building a short-barreled rifle or upgrading an existing SR-15 lower receiver.
Knights Armament is widely regarded as one of the premier manufacturers of AR-15 platforms. The KS-1 model brings modern features and compact handling to the proven SR-15 system, making it an excellent choice for shooters who prioritize maneuverability without sacrificing performance.
Key Features of the Knights Armament SR-15 KS-1 5.56 NATO Assembled Upper
13.7-Inch Barrel
Compact 13.7-inch barrel significantly improves maneuverability and reduces overall length while maintaining excellent 5.56 NATO ballistic performance.
Factory Assembled
Comes fully assembled with upper receiver, barrel, bolt carrier group, and handguard, ensuring proper headspacing and reliable function right out of the box.
M-LOK Handguard
Modern M-LOK compatible handguard provides a lightweight and versatile mounting platform for accessories while maintaining a slim profile.
Why Choose the Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver?
When searching for a premium 5.56 NATO assembled upper receiver with a short barrel, the Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver (121435) stands out as a top-tier option for builders and tactical shooters. The SR-15 platform has earned a reputation for exceptional reliability, accuracy, and durability under demanding conditions. This assembled upper allows users to quickly build a high-performance short-barreled rifle by pairing it with a compatible SR-15 lower receiver. The 13.7-inch barrel is a key advantage of the KS-1 model. This shorter barrel length dramatically improves handling and reduces the overall length of the rifle, making it ideal for close-quarters battle (CQB), vehicle operations, and scenarios where maneuverability is critical. Despite the reduced barrel length, the 5.56 NATO cartridge still maintains effective terminal performance at typical engagement distances when paired with quality ammunition. One of the biggest benefits of purchasing a factory-assembled upper from Knights Armament is the assurance of quality and proper assembly. Each upper is carefully built and inspected at the factory, ensuring correct headspacing, proper torque specifications, and reliable function. This saves builders significant time and eliminates the need for specialized tools or gunsmithing services. The M-LOK handguard offers a modern, lightweight mounting solution that allows shooters to customize their rifle with lights, lasers, grips, and other accessories without adding unnecessary weight. The slim profile improves handling comfort while providing ample real estate for attachments. Combined with Knights Armament’s precision-machined upper receiver and high-quality components, this assembled upper delivers the fit, finish, and performance the brand is famous for. The SR-15 KS-1 upper receiver is compatible with standard AR-15 lower receivers and magazines. Its black finish provides a professional, tactical appearance while offering good corrosion resistance. Whether you are building a short-barreled rifle, replacing an existing upper, or looking for a high-quality 5.56 NATO upper for a custom project, the Knights Armament SR-15 KS-1 13.7" Assembled Upper Receiver offers exceptional value and performance. Investing in a Knights Armament upper receiver means owning a component built to the same standards as those used by elite military and law enforcement units. The SR-15 KS-1 delivers the reliability, accuracy, and quality that serious shooters expect from one of the most respected names in the firearms industry.
- Knights Armament SR-15 KS-1 Assembled Upper Receiver
- Chambered in 5.56 NATO
- 13.7-Inch Barrel
- M-LOK Compatible Handguard
- Factory Assembled and Inspected
- Black Finish
- Premium Fit and Finish
- Ready to Install on SR-15 Lower Receiver
- Compact and Maneuverable Design
- Model: 121435
Technical Specifications – Knights Armament SR-15 KS-1 5.56 NATO Upper
| Specification | Details |
|---|
| Brand | Knights Armament |
| Model | SR-15 KS-1 |
| Part Number | 121435 |
| Caliber | 5.56 NATO |
| Barrel Length | 13.7 Inches |
| Handguard | M-LOK |
| Configuration | Assembled Upper Receiver |
| Finish | Black |
| Key Benefits | Compact Size, Factory Assembled, Premium Quality |
| Best For | Short-Barreled Rifle Builds, CQB, Tactical Use |
Shop the Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver today.
The Knights Armament SR-15 KS-1 5.56 NATO 13.7" Assembled Upper Receiver (121435) is a premium, factory-assembled upper featuring a compact 13.7-inch barrel and M-LOK handguard. Chambered in 5.56 NATO, this complete upper offers exceptional reliability, accuracy, and maneuverability. Ready to install on a compatible SR-15 lower receiver, it is finished in black and built to the highest standards by Knights Armament. Ideal for short-barreled rifle builds, tactical professionals, and serious shooters seeking a high-quality 5.56 NATO upper receiver. Part Number: 121435.
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