M4 vs. M4a1 carbine; destructive testing
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![Delta’s DI vs Piston AR15 (SFOD-D) [Range Talk]](https://sun9-48.userapi.com/nMU4BFkwFcK1L07EzX5T-fEFbKp_hAt0_SMBgg/xsxPaOFloCk.jpg)
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