Includes (1) Pro Blaster Half-Length Magazine Adapter only. Adapter is only compatible with the half-length magazines that come with the Nexus Pro, Aeon Pro, and MK3.  You can also use the adaptor with MK 1 and MK 1.1 Blaster (but the adapter will not work with the MK1 & Mk1.1 magazines). Free Shipping. Pro Blasters are not included.