This program is for MPX and MCX customers who purchased their pistol new, in a non-braced configuration. Promotion only available on firearms manufactured between July 19, 2022, and September 15, 2022. Stocks will add 8.75 inches to overall length.  Offer open to residents of the United States and District of Columbia 21 years of age or older only. Offer not valid in jurisdictions where short-barreled rifles are prohibited by law. Offer has no cash value, and may not be exchanged for any other benefit. Product provided under promotion may not be returned for refund. Exact stock model subject to change based on availability, delivery may be subject to back-order depending on inventory. SIG reserves the right to modify or cancel this offer at any time.This program is for MPX and MCX customers who purchased their pistol in a non-braced configuration. Stocks will add 8.75 inches to overall length. Offer open to residents of the United States and District of Columbia 21 years of age or older. Additional Terms and Conditions apply.