Top hat choices for a TX and that huge factory piston weight

[FPoole]

That is the tallest top hat I've ever seen. Seems like they used to be about 10-15 mm past the end of the spring. I use a plastic (Delrin) top hat and it's very light. I also had an old Delrin spring guide laying around that was a press fit in a spring I have. I cut it down to about 10 mm of the tube length and the back tip, that goes into the recess of the end plug was filed off. I shoved the little 10 mm into the top of my spring and the base of the guide, which is about 5 mm thick, is now my top hat for one of my guns. Any extra spacing that may be needed is always put on the rear guide to keep piston weight down. I don't really know the reason to do this, but everyone says to lighten the piston for best feel. This is on a short stroke gun and may be not the way to go on a MarkIII stroke gun.

[Barryg]

That is the tallest top hat I've ever seen. Seems like they used to be about 10-15 mm past the end of the spring. I use a plastic (Delrin) top hat and it's very light. I also had an old Delrin spring guide laying around that was a press fit in a spring I have. I cut it down to about 10 mm of the tube length and the back tip, that goes into the recess of the end plug was filed off. I shoved the little 10 mm into the top of my spring and the base of the guide, which is about 5 mm thick, is now my top hat for one of my guns. Any extra spacing that may be needed is always put on the rear guide to keep piston weight down. I don't really know the reason to do this, but everyone says to lighten the piston for best feel. This is on a short stroke gun and may be not the way to go on a MarkIII stroke gun.

I'm not sure if they still fit the huge TH but that is the size that was in my bought new HC about eight years ago

I wonder if AA still fit them and if so why.