Sig Sauer MCX RATTLER PSB 300 Blackout

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The SIG MCX in a discrete platform ― featuring a 3-position pistol brace and a 5.5″ barrel with PDW upper.


Rapid deployment, thin, agile and precise. This is the SIG MCX® Rattler. Featuring a 5.5″ PDW barrel, the MCX platform has never been more compact or accessible. Ready to go wherever it’s needed, the MCX Rattler PSB features a 3-position telescoping pistol brace for stability and easy concealment. This gun was designed from the ground up to be as discrete as possible while retaining all the robust capabilities of the MCX. Free-floating M-LOK® handguards matched with a PDW upper and 5.5″ barrel, the MCX Rattler PSB is the ideal choice for fast-moving operators. 


Model: PMCX-300B-5B-TAP-PSB
Action: Semi Auto
CALIBER: 300 Blackout
Barrel Length: 5.5″
Twist Rate: 1 in 5
Receiver Finish: Black
Stock Type: Telescoping 3 Position Brace
Weight: 5.1 LBS
Operating System: Gas Piston
Mag included: 1 30 Round Polymer


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