Sig Sauer MCX Conversion AR-15 Pistol Upper Receiver Assembly with Tapered Lug M-LOK Handguard Black

The Sig Sauer MCX Conversion Kit transforms your Mil-Spec AR-15 Lower Receiver into an adaptive and modular Sig Sauer MCX. The MCX Conversion comes complete with the Sig MCX Upper Receiver Assembly with M-LOK Handguard, Lower Receiver Stock Adapter, Side-Folding AR Buffer Tube Knuckle, and Sig Duo Trigger.