Shop for a variety of fully built upper receivers with varying barrel lengths as short at 5.5" and as long as 16". We stock and sell uppers from Sig Sauer for the SIG M400, SIG 516, MCX, and generic AR-15.
Sig Sauer AR-15 style upper receivers are currently offered in 5.56mm NATO and .300 Blackout. Other models and calibers will be addes as they become available.
Out of stock$1,359.00Sig Sauer MCX Rattler Upper Receiver - 5.5" .300BLK Learn More
Out of stock$1,286.00Sig Sauer MCX .300 Blackout 9" Upper Receiver for AR15 Learn More
Out of stock$1,286.00Sig Sauer MCX .300 Blackout 6" Upper Receiver for AR15 Learn More