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Wikipedia definition
1. Picatinny railThe Picatinny rail, alternatively known as the MIL-STD-1913 rail, STANAG 2324 rail, or simply "Tactical Rail" is a bracket used on some firearms in order to provide a standardized mounting platform, similar to the Weaver rail mount.
Read “Picatinny rail” on English Wikipedia
Read “ピカティニー・レール” on Japanese Wikipedia
Read “Picatinny rail” on DBpedia

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