The Raven TopStop upper receiver cover provides complete protection for AR-15 and M4 type upper receivers when detached from the lower receiver. Made from tough polymer construction in a distinctive orange color this cover snaps securely in place to seal the upper receiver completely.Raven TopStop Upper Receiver CoverCompatible with most AR-15 and M4 type upper receiversDesigned exclusively for detached uppersTough polymer construction with matte orange finishComplete seal prevents fouling from entering or escapingStops bolt carrier group and charging handle from sliding out during transportEssential for firearm maintenance storage and transport the TopStop cover keeps your upper receiver clean and components secure while providing easy visual identification with its bright orange color.