Sig Sauer

Build an MCX – SIG Sauer’s SUR300 Suppressed Upper Receiver

The SIG Sauer Suppressed Upper Receiver in .300 Blackout (SUR300) has been seen in the wild by police forces and already won military contracts, but now you can buy one for yourself off of Silencer Shop’s website. The SUR300 integrally suppressed upper receiver assembly is not listed on SIG Sauer’s own website as of yet, …

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