This video reviews a prototype 17 HMR AR-15 upper receiver from Garrow Firearms Development. The presenter, Joel Persinger (GunGuyTV), tests the gas-operated, direct impingement system with a locking bolt, highlighting its unique design for the 17 HMR cartridge. The prototype experienced some initial issues, including broken firing pins due to improper hardening and a need for lubrication, but ultimately ran well. The presenter emphasizes the importance of the locking bolt system for safety, preventing out-of-battery discharges common in some previous 17 HMR semi-automatics.
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