The Redline Selection of the Strike Industries Megafins XL is now available... "The Mega Fins-XL Handguard Line is the latest and greatest rail from Strike Industries. SI is finally offering a wider handguard rail system available in both M-Lok and Key-Mod versions ranging in lengths 7-inch, 10-inch, 11-inch, 12-inch, 15-inch, 16.25-inch and 17-inch!