Tech Target Internals Replacement

This mod maximizes the potential of the Tech Target while keeping the stock look. I have tried many other TTG mods such as the standard coupler, single barrel, and MDET but this is by far my favorite method.
Materials
-1" PETG Tubing
-3/8" square rod
-K26 spring
-1x 1/2" PVC Coupler
-Small segment of 1/2" SCH 40 PVC
-E-Tape
-Packing Tape(Or just use E-tape)
-1x 6/32 Hex Locknut
-1x 2" long 6/32 screw
-2x 1.5" long 6/32 screw
-1x NF plungerhead w/ O-ring or equivalent