The SIG MCX Rattler SBR AR-15 delivers so much from so little: rotating bolt/gas piston operation, M-LOK handguard, 30-round polymer magazine, folding skeletonized minimalist stock and more. It has two models: 5.56 NATO (1:7” twist) and 300 Blackout (1:5” twist). The product’s heart is a 5.5” barrel that’s fronted by a three-pronged flash hider.

The receiver is topped by a long monolithic Picatinny rail. Behind it as an ambidextrous charging handle.

SBR stands for short-barrel rifle. The 5.5” barrel is cold hammer forged steel. It sits largely in a free-floating alloy M-LOK handguard that provides several attachment points. The gas block can be set for suppressed or unsuppressed fire.

The folding skeletonized minimalist stock has a tall and skinny ski-boot profile. It’s ultra-thin and made of aluminum. Controls are ambidextrous and can be used even when the stock is folded back to the left.

The trigger is a Matchlite Duo. This is Sig’s own clean-breaking two-stage curved trigger. Pull weight is about 5.0 pounds. The grip has a slim profile and a contoured bottom.

Regardless of caliber, the gun is 8.0” tall and 2.8” wide. The 5.56 NATO is 23” long and has a 1/2”x28 TPI thread. The 300 Blackout model is 23.5” long.

Do you have a SIG SAUER MCX RATTLER PISTOL for sale? click here.


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