Smith & Wesson Releases the 5.56mm M&P SPORT III rifle

By Tim Stetzer

Smith & Wesson just dropped their latest AR pattern rifle, the M&P Sport III. It’s a 5.56mm rifle with a 16-inch barrel and mid-length gas system. It has a free-float handguard with tons of M-LOK slots. It also features a 16-inch, 1:8 Twist 5R rifled barrel and A2 flash hider. Luckily, the press release explained what 5R means. Apparently 5R rifling makes consistent contact with the projectile and makes the rifle more accurate than one with standard rifling.
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Source: The Truth About Guns