Regulator installation guide for BSA models
Before you you start, realize this;
You are working on a high pressure rifle; this could potentially be harmful to you or bystanders if you do not know what you are doing.
Do not attempt to install this regulator yourself if you do not have a clear understanding of how these pcp rifles and regulators work.
Installation and operation is done completely at your own risk.
Installing this regulator might void your rifle’s factory warranty.
We cannot be held liable for any accidents in relation to this regulator and its installation.
Before you start, make absolutely sure that ALL the air is drained from the pressure tube. If there is a pressure gauge, it will give you just an indication. Dry fire the rifle to make sure all the air is out of the rifle.
Remove the action out of the stock.
Loosen both the breech screws a bit so there is a bit space between pressure tube and breech. This prevents scratches on the tube when turning it loose.
(you may also remove breech totally)
Turn off the pressure tube. If it’s tight there could be pressure inside! Double check this.
When turned loose you can see the brass valve house
Fill the the end of the valvecap with a (few) small metal rings. There must be a small part brass sticking out where the spring will center on.
Remove the restrictor and screw the valvehouse back together
Place the volume ring, regulator firmly against the valvehouse and put the pressure tube below against the hammer house.
Mark on the paint tape the place of the decompression hole. This has to be between the two o-rings of the regulator. So you have a big tolerance.
Take a 1 or 2 mm drill and make the hole into the pressure tube
Debur the pressure tube very carfully on the inside. Use very fine grinding paper (600-1200)
This is very important otherwise the 0-rings will be damaged with placing the regulator.
Some bsa pressure tubes have small scratches in the length direction of the tube.
You can check this by removing the fillcap and look trough the tube into the light.
If you see these scratches then you have to polish the tube on the place the reg has to come.
Use silicone grease inside the tube and also grease the o-rings of the regulator.
Place the regulator inside the tube. Press gently until the first o-ring is past the hole.
After that push in the volume ring.
Place the pressure tube back on the valvehouse and thighten it together.
This is all.
Unscrew the endcap (there are 2 screws in it) and remove spring, hammerweight, rubber ring.
Inside the end cap house there is a screw what can be used for setting the hammerspring tension.
I usually clamp it in a vice and use a pillar with a piece of leather belt to prevent damage.
After that you can see the adjusting screw inside the housing.
Remove the extra hammerweight and rubber ring and mount it back together.
Now you can adjust the hammer spring tension from the outside.
Adjusting the pelletspeed.
If you follow these steps you will have pretty much a optimal balance between air-usage and shotcount.
Remember the regulator will determine the maximum pelletspeed.
Fill the rilfe with air.
Turn in hammerspring to the maximum tension. Do some shots and measure the pelletspeed.
If the speed is near to what you want then continue. If not, see below.
(If you get way to much speed, then lower the reg pressure a bit.
If you do not get enough pelletspeed then increase the reg pressure a bit.
You can in- or decrease it by setting the screw on top of the regulator conform the instructions what came with it)
You could ease make yourself a tool with a broomstick etc. so you can set the pressure by removing the fillcap of the rifle. So you do not have to dismantle the gun again.
Turn back the hammerspring tension and shoot and measure the speed. Keep doing this until you see the pelletspeed decreasing.
