The Alexander Arms UST17 Upper Parts Kit 17 HMR 18" Black Cerakote Aluminum Receiver M-LOK Handguard for AR-15 Includes 2 Mags is a complete rimfire upper assembly built to drop onto a standard AR-15 lower. It pairs an 18" stainless fluted barrel with an A2 flash hider, blowback operating system, and black Cerakote aluminum receiver, delivering reliable 17 HMR performance with modern M-LOK handguard versatility.
This upper is optic ready and ships with two 10-round magazines plus a dedicated parts kit for lower conversion, making it a straightforward way to configure an AR-15 for small-game hunting, varmint control, or economical range training. The 1:9 twist rate stabilizes common 17 HMR loads, while Alexander Arms’ attention to fit and function provides consistent cycling and accuracy in a lightweight 4.5 lb package.
Key Features:
- Manufacturer: Alexander Arms
- Model: UST17 Upper Parts Kit
- Caliber: 17 HMR
- Condition: New
- Action: Blowback
- Finish Color: Black Cerakote
- Barrel Length: 18"
- Number of Magazines: 2
- Capacity: 10
- Threaded Barrel: Yes (1/2-28RH with A2 flash hider)
- What's In The Box: Complete upper, two 10-round magazines, parts kit for lower conversion
- Weight: 4.5 lbs
- Length: 37.6"
| __Capacity | NA |
| __Model | UST17 Upper Parts Kit |
| __Barrel Length | NA |
| __Optic Footprint | NA |
| __Action | NA |
| __Caliber | .17 HMR |
