b'15 Suppressor Ready RailsA strong, lightweight and ergonomic rail system that 13.5 13 features 7 sides of M-LOK compatibility, constructed 12.5 from 6061-T6Aluminum, and weighing from 7.2oz up 11.5 to 11.62oz.10.5 MSRP: $169.95-2009.57.5'