The Maxim Defense Buffer Spring Kit is designed to work with the Maxim Defense CQB Pistol Brace or CQB Gen 7 Stock, which are featured on the Daniel Defense PDW Pistol (brace) or PDW short-barreled rifle (stock). This kit comes with two replacement springs. The red spring is to be used when running your Daniel Defense PDW unsuppressed while utilizing subsonic ammunition. The silver spring, or standard spring, is meant to be used for unsuppressed fire with supersonic ammo or suppressed fire with either subsonic or supersonic ammo.
All Daniel Defense products carry a 100% satisfaction guarantee against defects in original materials and workmanship. If your Daniel Defense product shows evidence of such defects, Daniel Defense will make every accommodation to fix, repair, or replace your product in the most expeditious manner possible. Daniel Defense does not warranty products or damage caused to our products by the correct or incorrect installation of other manufacturer's products.