Product Description The Raven Concealment Systems TopStop is a protective upper receiver cover designed to snap onto most AR-15 or M4-style upper receivers when the upper is detached from the lower. It completely seals the upper receiver to help prevent fouling and debris from getting in or out during transport or storage, while also keeping the bolt carrier group and charging handle from sliding out as the upper is moved around. Built from tough polymer in a Wolf Gray matte finish, the TopStop is a simple, durable way to protect critical components and keep your upper receiver assembly secure. Product Highlights Snaps onto most AR-15/M4 type upper receivers for quick protection and handling Seals the upper receiver to help keep debris and fouling contained Helps prevent the bolt carrier group and charging handle from sliding out in transit Tough polymer construction built for repeated use Designed specifically for uppers detached from the lower receiver Specs Brand: Raven Concealment Systems Product Type: Upper Receiver Cover Compatibility: Most AR-15 / M4 type upper receivers (when detached from lower) Material: Polymer Finish/Color: Matte, Wolf Gray Manufacturer Part Number: TOPSTPWG UPC: 810022111192 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.