This section covers various 'how-to' kind of information that I've gathered from time to time.

For now it covers :

How to strip a JAC (and HSU WEI) Browning Hi Power (courtesy of Asher)

How to solve a problem with the Marushin Raging Bull not releasing gas when the trigger is pulled (courtesy of Marushin).

A FPS/Joule convertor in Excel format - Click Here to view.

A simple guide to what you can upgrade on your gas gun for more power.

Stripping a JAC (or Hsu Wei) Browning Hi Power

.

1.Take off the grips. Pull the slide back and unscrew the outer barrel, 
remove the inner barrel. NB you can do this later if you prefer.
2. Push out the slide lock lever. You may have to gently persuade it from 
the ejection port side using a pin punch.
3. Unscrew the (allen?) bolt retaining the safety catch and remove both 
halves. BE CAREFUL: theres a little bastard of a ball-bearing that will 
attempt to escape at this point (it keeps the safety in place during normal 
operation).
4. Remove the frame screw in front of the slide lock and the  two frame pins 
in the grip part of the body. There may be another screw that needs remocal, 
but IIRC it's just the one and two pins usually.
5. Push the hammer spring assembly up and swing it forward out of it's 
cradle.
6. You should now be able to lift the entire slide/trigger/hammer assembly 
free of the frame.

Stripping the mechanism.
I really don't recomend this unless you absolutely have to do it, although 
after a couple of times it becomes second nature, it can be a shocker if 
you're used to WA units.
1. Remove the barrel etc (if you haven't already).
2. Push out the pin that holds the recoil spring in place and pull the 
hammer/spring guide up and out of the slide
3.Undo the allen bolt that holds the piston assembly together.
4. This is the fun part. After a lot of having and rouging you should be 
able to expose a small screw that holds the guide frame for the gas parts in 
the slide. It screws into the rear sight. Take it out and wrestle with the 
thing until you can free the mechanism from the slide body. BE CAREFUL: it's 
not as robust as it looks, thanks to the joys of pot metal (TM).

Problem with Marushing Taurus Raging Bull not releasing Gas

When I purchased my Raging Bull it wouldn't fire BB's properly and I diagnosed this as gas not being released when the trigger was pulled.

I decided to contact Marushin directly (via their website - http://www.marushin-kk.co.jp/) and was rewarded with excellent customer service.

My mail was : "I have recently bought a Marushin 8mm Raging Bull. It is a lovely gun, but mine does not release any gas when the trigger is pulled.
I have taken the side panel off and the problem appears to be that part 32 is not correctly positioned in relation to the trigger and the hammer. I cannot see any broken parts.
Can you give me any information on how this part is positioned, so that when the trigger is pulled gas is released?
If you can help I will be most grateful. I also own a Marushin Mauser M712, which I admire greatly and which encouraged me to buy the Raging Bull. No one in the UK (where I live) seems to know anything about your guns (a great loss to them!), so I have turned to you for help.

Marushin's response was :

We are sorry for you are in trouble.
We send you 3 photos and we wish they will help you.
"#32&83"
Please check the other side of #32.
If the shape of #83spring is like above one, it is OK.
If like below one, the spring is not working and you have to replace new #83.
Maybe this is the reason for not releasing gas.
We can send you #83 to you for free.
If you need it, tell us your address.
The rest of photos are how to adopt #32&83.

My part 83, did indeed look like the lower one and I request a replacement. The part arrived about a week after I requested and, once fitted, resolved the problem.

Upgrades and their effects.

This was someone's reply to a question I posted on a forum, asking what upgrades were possible and their effect.