Want to build a pre-ban 16 inch carbine. Will need everything in front of the upper receiver: barrel, site, gas tube, handguards, ???. . If possible, do not want to wait for 6-8 weeks ! ! ! (hope I'm not ask for too much ! !). What do you have in inventory ? Would like the "Superlight 16", but would consider anything else in stock. Will call on Monday to place an order. Should I ask for customer service or ? ? ? ? Thanks for the help ! !