Description
TWC Ultra Premium Kit - For BSA Mercury MK1, MK2, MK3, MK4, S -
This kit contains all that is required to Ultra Tune your weapon, including standard mainspring or upgraded mainspring please choose your preference when ordering. Also includes Ultra Spring Guide, Top Hat, Piston washers, Breech/Transfer seals, Ultra grease & lube, along with full instructions & parts plan.
Extra Information
Brand:
TWC
TWC Part Number:
TK003
Choice of Springs:
Standard MS012 , OX 1 , OX Accelerator 1 or Titan XS 1
