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Is the SIG m400 Mil Spec?

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The upper receiver features an integrated MIL -STD 1913 accessory top rail for mounting optics and accepts most M16/AR15-style furniture. An Enhanced version of the SIG M400 features all Magpul furniture. Chambered in 5.56 NATO, the SIG M400 will be available in semi-automatic for commercial users.
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