Alexander Arms AR-15 UST17 Upper Parts Kit 18 Inch .17 HMR M-LOK Handguard Magazines

Product Description The Alexander Arms UST17 Upper Parts Kit converts a compatible AR-15 lower to the flat-shooting .17 HMR cartridge with a complete 18-inch upper assembly and included conversion parts. Built around a black Cerakote-finished aluminum receiver and an M-LOK handguard for easy accessory mounting, this upper uses a blowback operating system for consistent cycling. It comes ready to run with an A2 flash hider installed and includes two 10-round magazines, making it a purpose-built option for small game, varmint, and range use.

Product Highlights

• .17 HMR AR-15 upper assembly with included lower conversion parts kit
• 18-inch barrel with 1:9 twist rate for precision shooting
• M-LOK handguard for flexible accessory mounting
• 1/2-28 right-hand muzzle threads with A2 flash hider included
• Includes two 10-round magazines; lightweight upper (approx. 4.5 lb)

Specs

• Brand: Alexander Arms
• Manufacturer Part Number: UST17
• UPC: 819511021295
• Platform/Fit: AR-15
• Caliber: .17 HMR
• Barrel Length: 18 in
• Twist Rate: 1:9
• Operating System: Blowback
• Handguard: M-LOK
• Receiver Material: Aluminum
• Receiver Finish/Color: Black Cerakote
• Muzzle Threads: 1/2-28 RH
• Muzzle Device: A2 flash hider (included)
• Magazines Included: Two (2)
• Magazine Capacity: 10 rounds (each)
• Weight: 4.5 lb (upper)

Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product’s manufacturer.