This video details troubleshooting and testing of two custom-built firearms: a 7.62x39 pistol and a .308 AR-10. The presenter, Elliott Delp, addresses previous cycling issues by adjusting the gas block alignment on the 7.62x39 pistol and modifying the buffer system. The .308 build also faced cycling problems, with potential causes like a mis-milled charging handle and buffer weight being investigated. The testing reveals partial success with the 7.62x39 pistol using Tula hollow points, but subsequent attempts with Red Army FMJ ammunition encountered feeding and cycling failures.
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