SIG MCX .300 Blackout assault rifle Neptune Spear (MCX Neptune Spear)
The .300 Blackout MCX line, designed and manufactured by SIG Sauer, is available in both semi-automatic and automatic versions and features a short-stroke gas piston system, which is inherited from the earlier SIG MPX submachine gun. The .300 Blackout ammo and the MCX are compatible with all AR-15 magazines.
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