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Identifying Gas Pistons - Top to bottom: 1)Sadlak Industries, LLC titanium nitride M14 NM 2) Sadlak Industries, LLC titanium nitride M14 3) Springfield Armory, Inc. M1A 4) USGI M14 5) Smith Enterprise, Inc. thin dense chromium plated M14/M21A5 6) Mainland Chinese M14. Photo by Different.
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