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Hi Dana and welcome. The 17 HMR AR-15 upper features an 18" barrel, 1:9 twist rate, 1/2-28RH threading, an A2 flash hider, a blowback operating system, two 10 round magazines, and a parts kit for lower conversion. Blowback Bolt and Charging Handle. Cheers and stay safe! -- https://www.alexanderarms.com/product/17-hmr-complete-upper-assembly/

Yes, it comes with the bolt, magazines, and charging handle.