Other than a longer cylinder, I have put my s200 back to normal. From 155 to 100 I get 50 shots slowly increasing, flattening out then decreasing. The fps goes from 770 to 790 and back down. The fps deviation of the 40 in the middle is no more than 5, most 3 or less. Will adjusting things extend and...

I had an external huma then fitted a longer cylinder and quick fill. Swapped the huma to an internal Altaros.
Both performed pretty similarly.
Now taken the Altaros out and gone back to normal.

I fitted one in my 200. Crept a bit after a few months. Adjusted it and all good.
As said, easy to install with minimal alterations

My mk2 pro target. Altering the reg and hammer I can get the fps I want but it's noisy.
Reduce reg and hammer, fps drops and it's quieter. Just thought a lighter valve spring with the lower reg would allow a lower hammer tensions well. I have a reg tester and can set it accurately.
It's a mk3 reg

Would using a weaker valve spring mean you would need less hammer for the same results?

Mine doesn't like the qys. Over 30 yes they open up.
55yds and mine loves aa8.4 in 452. If the group starts opening I have to put a few felts through then they are back to tight. Never measured though.
Keep meaning to try 453 jsb as 200 loves those.

FB are strict on rifles and guns. There may be the odd time when posts or users are blocked especially if a post is reported.

Original post is from 2015. Probably not.
Did you click on the unread post button?

Emailed them. Got a reply next day.
Date of manufacture 20.07.1998.

Guess that makes it a mk2?

Or Julian on here will be able to source you one (he's very good).

Altaros do them as well.