For the TM glock 17, you have many options of a metal slide.....
PGC glock 17 (9x19mm markings)
airsoft surgon (
www.redwolfairsoft.com) glock 21 (.45) glock 22 (.40) and glock 17 (9mm) trades are avail.
Airsoft surgon aka AS slides require 0.00000% modification. I highly recommend them.
Though I dont have any experience with PGC TM glock 17 slides, I do know they ARE high in quality....
-alex