StopBox USA has widened its recall of the AR-15 Chamber Lock Pro after further evaluations revealed that a manufacturing defect in the products design could allow locks to be forcibly removed, rendering them ineffective as a firearm security measure. The U.S. Consumer Product Safety Commission (CPSC) first announced the recall on September 4, 2025, covering approximately 300 units shipped between June 2 and July 15. The locks, sold for around $150 in anodized red and black aluminum, use a hand-gesture code mechanism for operation and bear the marking CHAMBER LOCK PRO AR-15. While no injuries or unauthorized discharges have been reported, safety officials stress that affected users must discontinue use immediately. According to StopBox, the root of the defect lies in a CNC machining adjustment that compromised the tolerance of the chamber fit, allowing brute-force removal under certain conditions. The Spokane Valley, Washington-based manufacturer acknowledged the issue in a dedicated recall notice and described corrective measures now in place. These include the addition of inspection gauges, expanded post-CNC checks, and tighter vendor oversight of raw materials. The company emphasized its commitment to addressing customer concerns promptly and reinforcing its brand reputation for innovative firearm storage solutions. The CPSC advisory outlines clear instructions for consumers. Owners are advised to stop using the locks and to secure affected firearms with alternate safety devicessuch as a gun safe, cable lock, or chamber flaguntil the recall remedy is complete. Customers who purchased within the recall window are eligible for either a full refund or a replacement lock. StopBox has made available prepaid return labels and a recall portal that allows customers to check their eligibility by serial number and purchase date. Retailers and dealers have also been directed to remove unsold inventory, post recall notices prominently, and assist customers with the return or replacement process. With the recall carried out under CPSCs fast-track procedure, the company aims to resolve the issue quickly and prevent further distribution of defective units. Industry observers note that the defect affects a relatively small production run, but it underscores the stakes for accessory manufacturers competing in a security-critical niche. For firearm owners, the takeaway is clear: any chamber lock that can be bypassed undermines the entire layered defense strategy of firearm safety. Mechanical devices designed for quick access must balance usability with uncompromising reliability. A lock that can be removed with force negates its purpose and could expose owners to significant liability if unauthorized access occurs. This recall serves as a reminder to verify the quality and durability of all aftermarket safety devices before relying on them.