Gun Report

SIG Sauer M400 Classic RM400-16B-C 5.56mm NATO, $1250

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Extraordinary accuracy. Featured one of the most consistent triggers we've tried, as well as costly ambidextrous controls. A free-float handguard would likely make this the perfect carbine.

SIG Sauer M400 Classic RM400-16B-C 5.56mm NATO, $1250

Gun Details

Model Name
Model Number
Home Defense
Weight Unloaded
Muzzle Device
Length of Pull
Action Type
Action Finish
Barrel Finish
Trigger Pull Weight

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The trick to adding an ambidextrous safety is making the offhand side comfortable to use. The selector lever did not interfere with our left handed shooter's trigger finger. The left-side magazine release worked best when pressed on its rearward edge. We'd prefer SIG's L-shaped bolt latch on all our AR-15s. The hideaway grip was more comfortable than most. Note the auxiliary QD-sling attachment point, upper right.
If any aspect of the SIG Sauer M400 classic justifies its price tag, it would be the trigger. Note the reduced mass and glass-like surface area of the hammer. The trigger-pull weight of 7.6 pounds was secondary to its precision. We saw this rifle selling for as low as $819, which would be a bargain at that price.

Read Gun Tests Rating and Recommendation