TX200 - Mk2 piston into a Mk3?

[cooper_dan]

What you're describing is the setup I use in my HFT gun.
I'm using mk2 spring and guides

[Weasle]

What you're describing is the setup I use in my HFT gun.
I'm using mk2 spring and guides

Cheers Dan

[FPoole]

Note that the MarkII weight/top hat doesn't fit into the end of the spring, like the MarkIII, it's just a thick weight and looks very much like it's not in the piston. As noted above, you should have about 110 mm depth, inside, from piston skirt to the front end where the top hat sits.

[cooper_dan]

Note that the MarkII weight/top hat doesn't fit into the end of the spring, like the MarkIII, it's just a thick weight and looks very much like it's not in the piston. As noted above, you should have about 110 mm depth, inside, from piston skirt to the front end where the top hat sits.

Actually it does. It looks like a mk3 version but the thinner section has a very coarse thread on it. This screws into the 3 collapsed coils. I think you are thinking of the additional washer (9mm thick I think) which may or may not have been used from the factory, depending on the power

[FPoole]

Actually it does. It looks like a mk3 version but the thinner section has a very coarse thread on it. This screws into the 3 collapsed coils. I think you are thinking of the additional washer (9mm thick I think) which may or may not have been used from the factory, depending on the power

Yes, I was a bit un-clear and was talking of the weight only. The top hat will always pull out with the spring on a MarkI/II. That 9mm weight looks just like the bottom of the piston and is easy to miss. Don't ask how I know, but I had a .177 MarkI shooting 8.64 H&N's at 850 fps, until I figured out the weight was still in there.

[prosport.177]

Yep and more often than not I have found metal, brass turned up washers hiding under the top hat. These are the result of previous owners upping pre load, or upping power.. These can get stuck.. Only way to know is to measure spring room inside the piston..
The last time I had one of these I had to remove latch rod from piston to find a half inch lathe turned washer in front.

[NickG]

Yep and more often than not I have found metal, brass turned up washers hiding under the top hat. These are the result of previous owners upping pre load, or upping power.. These can get stuck.. Only way to know is to measure spring room inside the piston..
The last time I had one of these I had to remove latch rod from piston to find a half inch lathe turned washer in front.

Nice what some people get up to in the name of tuning !, loctite can be the enemy here , if its not cleaned off properly after fitting the latch rod the piston weight gets glued in as well .