Alexander Arms UST17 Upper Assembly 17 HMR 18"
Alexander Arms UST17 upper receiver for AR-15 in 17 HMR with 18" stainless fluted barrel, M-LOK handguard, blowback operation, and two 10-round magazines included.
Fits: AR-15
Alexander Arms UST17 Upper Assembly
The Alexander Arms UST17 represents a thoughtful approach to converting your AR-15 platform to the efficient 17 HMR cartridge. This upper assembly delivers the precision and reliability shooters expect from a purpose-built rimfire platform.
Key Features
- Barrel: 18" stainless steel with fluted profile for reduced weight and improved heat dissipation
- Caliber: 17 HMR with 1:9 twist rate optimized for standard projectiles
- Threading: 1/2-28 right-hand with A2 flash hider included
- Operating System: Blowback design, proven reliable for rimfire applications
- Handguard: M-LOK compatible for modern accessory mounting
- Weight: 4.5 pounds for manageable handling
- Finish: Black anodized aluminum receiver
What's Included
This kit provides everything needed for conversion:
- Complete upper receiver assembly
- Two 10-round magazines
- Lower receiver conversion parts kit
- A2 flash hider
Why Choose 17 HMR?
The 17 HMR cartridge offers exceptional accuracy and flat trajectory in a rimfire platform. It's ideal for precision shooting, small game hunting, and varmint control with minimal recoil and noise compared to centerfire alternatives.
This upper assembly allows you to leverage your existing AR-15 lower receiver while gaining access to 17 HMR's distinctive ballistic advantages.
