In this episode of TFBTV, Hop checks out the new SIG-Sauer M400 X-Series SDI. Don’t let the awful, terrible, truly indefensibly bad name fool you, the X-Series SDI is actually pretty cool. This AR adopts some of the improvements of SIG’s Spear LT rifle and is more full-featured than the older M400 Tread series rifles. But it also costs way more, so it really ought to be.

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