I had two of these in 17 and 18C form.
Both broke. Some issues I had with both.
Slide locked back for some reason and both had to be cut in half to get the slide off.
You'll need the stock outer barrel in order for a new replacement slide to work other than a Stark Arms.
Magazine catch with the steel plate integrated in actually hinders performance and reliability. I know this plate was suppose to improve durability but in the end it just failed because it came loose. Magazines have a hard time seating properly due to this.
I also believe the rear sight is proprietary as well with the rear plate holding the bbu in place. Not TM compatible.... though I can't remember exactly.
The recoil spring guide has a duel spring system. The little shim that is plastic that separates the two will break. It is really cheap plastic.
Gun eventually will start to lock back for some reason. Slide and barrel won't mesh properly resulting in a permanent lock when it is pulled back too far.
If you look at the gun and see all the improvements made to the TM design is is really neat but they failed in doing so... very sad
Guys avoid this gun. Get a WE and upgrade it. Will be much cheaper than upgrading a TM and its just as reliable