Alexander Arms UST17 Upper Receiver Kit 17 HMR 18" Fluted Barrel, Black Anodized - UST17

This is a complete upper receiver kit for AR-15 platforms chambered in 17 HMR, featuring an 18" fluted barrel with 1:9 twist rate and 1/2-28 RH threading. The kit includes a black anodized aluminum upper receiver, M-LOK handguard, A2 flash hider, standard charging handle, and two 10-round magazines, with a blowback operating system and lower conversion parts included.