Sig Sauer MCX Conversion AR-15 Pistol Upper Receiver Assembly 5.56x45mm NATO 5.5″ with Tapered Lug M-LOK Handguard Black

Convert any MIL-SPEC AR Lower into a MCX Rattler with this Sig Sauer MCX Conversion AR-15 Pistol Upper Receiver Assembly 5.56x45mm NATO 5.5″ with Tapered Lug M-LOK Handguard. Complete with upper assembly, lower receiver stock adapter kit, side folding AR buffer tube knuckle, and match duo trigger kit.

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Rapid deployment, thin, agile, and precise. This is the MCX Rattler. Featuring a 5.5″ PDW barrel, side folding AR buffer tube knuckler, and match duo trigger kit, the MCX platform has never been more compact or accessible. Ready to go where-ever it’s needed. This upper receiver was designed from the ground up to be as discrete as possible while retaining all the capabilities of the MCX. Free-floating M-LOK handguards matched with a PDW upper, the MCX Rattler upper receiver is the ideal choice for fast-moving operators.Â

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