This combo is for a Sig Sauer MPX short barreled rifle and Dead Air Ghost suppressor. The package comes with a M13.5x1LH fixed mount to attach the Dead Air Ghost to the MPX. Individually purchased, this combination package would run $2820. This is package consists of two NFA items and $400 in ATF stamps / transfer fees will be applied to all Texas residents.
MPX SBR: http://www.capitolarmory.com/class-3-nfa/sbr-short-barrel-rifle.html
Dead Air Ghost: http://www.capitolarmory.com/dead-air-ghost-m-45-suppressor.html