Picked up the TM g18c last week and just received the SD slide kit. Upgraded recoil and hammer spring (Guarder 150% recoil and hammer spring) and put in a TK hop twist barrel and nine ball packing.
Kicks hard, full auto is ***CRAZY*** with propane.
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The shooters design slide kit is awesome - I had a PGC TM 18c slide kit which needed fitment. The SD kit went on with no issue.
If you've got a TM g18c and are looking to replace the slide and outer barrel - go with the SD kit. The finish is tough and like I said, no filing or Dremel needed.