$850 shipped OBO Custom Polarstar F2 Lambda MK48. FCU is stored underneath the barrel as well as the batteries. The box mag is wired to wind when the trigger is pulled. The FCU and Box mag run off separate batteries. Has a stainless TBB. Will come with the everything shown 4x 7.4v Titan batteries Element Peq15 La5 Replica eotech 552 Replica TD Vert grip Saw padded sling M240 padded sling Mod 0 stock and heat shield/ris