BCA .224 Valkyrie Upper, 20" Stainless Heavy Weight Barrel, Rifle-Length, 15" MLOK Split Rail, BCG & Charging Handle, Anodized - $224.95 This BCA AR-15 Complete Upper has a 20" barrel with a Heavy Weight profile, made of 416R Steel with a Stainless Steel finish, and features a 1: 7 Twist Rate, a