Lancer is giving free replacement follower for L6AWM magazines made in March 2014(stamped 3/15). Smaller follower could induce failure to lock open after the last round.
To get a replacement, contact
LSWarranty@Lancer-Systems.com and include the following information: Retailer, Date of purchase, Quantity of followers that need replaced, and your Shipping Address. For additional questions, please call 610.973.2644.