This video compares the penetration capabilities of 9mm and 5.7x28mm handgun rounds against a Honda Accord door. The 9mm rounds, both 115gr and 124gr NATO spec, consistently penetrated both the outer and inner door panels, with one stopping on interior plastic. The 5.7x28mm rounds, including 40gr V-Max and 27gr hollow points, showed good initial penetration but struggled to consistently pass through both door panels, with some fragmenting or stopping on the inner door structure.
This review of the Palmetto State Armory Rock pistol in 5.7x28mm highlights its affordability compared to the FN Herstal variant. Initial range sessions encountered malfunctions, potentially due to a heavy aftermarket optic and lightweight frangible ammunition. Reliability improved significantly after switching to Federal 40-grain 5.7x28mm ammunition and removing the optic, suggesting a combination of ammunition and slide weight sensitivity.
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