The Polar M400 is a GPS watch that acts as an all-day activity tracker, making it useful even when you're not running or cycling. Why you can trust Tom's Guide Our writers and editors spend hours ...

Editors' note, December 31, 2014: Polar's Flow app has been updated on Android with support for the M400. Polar's latest watch looks to further bridge the gap between activity trackers and GPS ...

According to the gun blog The Truth About Guns, Sig brought back the Sig M400 Tread and the M400 SDI ... circa 2012 by a ...

SIG Sauer’s M400 was the company’s first AR-15-style carbine. It caught enthusiasts largely by surprise at its introduction—roughly a decade ago—but it quickly became a popular choice in a ...