This SIG Sauer MCX Rattler Conversion Kit, includes an MCX upper receiver, conversion kits for a mil-spec AR-15 lower receiver, and Sig Sauer two-stage trigger. The included tigger conversion kit is required for proper MCX Rattler operation. The MCX Rattler features a dual position gas valve for suppressed and unsuppressed usage.
The SIG Sauer MCX Rattler Conversion Kit includes the SIG Sauer MCX Rattler upper receiver with 5.5″ .300 BLK barrel, bolt carrier group, buffer tube eliminator/stock adapter, side folding adapter SIG Sauer Match 2 stage trigger, and QD adapter.
Sig Sauer MCX Rattler Upper Receiver Assembly, .300 BLK, M-LOK Handguard, 5.5 inch, Black, UAMCX-5B-300-BLK-TAP