you will only get a max power out of a tx 200 I dont know what that is [i GUESS 14 FTLBS ] no matter how big a spring or gasram you use the power will be determined by the air cilinder size .I fitted a 12ftlb gasram to a lightning once after the spanish spring failed . never again .it shot fine for a while but failed quite quickly .[you get a 6 mounth garranty I wonder why ]I have replaced the gasram with xs spring ,tight derlin spring guide ,and a hardened steel top hat that sits on a ptfe washer .The gun shoot great with little sound [for a springer].I feel it shoots better than the ram .YO