Royale 400 regulator replacement

Your will have to remove the barrel in order to unscrew your foster fitting (2 screws to remove on the top of the block). Just take care to correctly align the barrel with the transfer port when you put everything back on.

With Tomico and Ernest videos it is an easy game do not worry just take your time.

have fun

You do not need to remove the barrel just to change the regulator. You can remove the the foster fitting (silver then the black fitting in front of the regulator). Even the the valve and valve seat can be pulled without removing the barrel. If you do decide to remove the barrel, make sure you loosen the grub screws enough so not to scratch the brass o'ring surface when pulling for removal.
Also do not dry fire it or even fire it at low pressure it will mash the valve (no back pressure to offset the hammer force) and can ruin the block/receiver as well. You can bleed the trapped pressure from that hole that goes through the block. That is the valve in the hole you can see through (5 minutes into video shows the hole and valve). Lift it off the seat until you hear air bleed through the barrel with a narrow soft dowel or pencil. Ernest uses a allen wrench, I'm just afraid to scratch it. You can also bleed from loosening the gauge slightly.
Warning Just make sure you have no trapped pressure before try to unscrew the black piece or the silver foster it is screwed into.
Another tip is align the foster up with the stock before you put bottle pressure on it. You don't have to crank down on the nut that retains the foster. Just cinch tight then back off to align it.

As Dirte said you will have to bleed the trapped pressure between the reg and valve but i would not recomend you to do it opening the valve manually as is more likely to damage something, the valve is the most fragile part in the entire rifle. In fact, the screw that secures the stock to the action is a bleeding screw, just unscrew it and the air will come out pretty violently haha. Don't worry tho as you can't do any harm at all. Remember to tight down that same screw before reasembling the bottle (it can be unscrewed with pressure in it btw)

First of all remove the bottle obviously as if you bleed the reg chamber with the bottle attached, you will end bleeding all the air on the bottle too. As dirt said, that's necessary to unscrew the entire foster fitting from the action.
In the video he didn't do it because as the oring was damaged, all the air on the reg chamber already escaped out of there

This might be the most secure way to remove any leftover air...
Slowly unscrew the black nut that the stock screw screws into. it should have two flat spots on it and it's located behind the gauge. You could unscrew the gauge as well but, you stand the chance of buggering it up. 
Thanks for posting my video! I'm really glad you got some useful info from it!
Tom

Impossible to know the new reg pressure unless you have a reg tester and i don't think you got one. The only way to know is installing it and check the pressure when the velocities starts to drop. Regarding the bottle, hand tight and normal thread direction, when screwing it again you will feel a back stop on the thread and you'll know you're ok at that point. Good luck

That's pretty normal i think but may vary. Yesterday i shot an email to AoA asking about most recents Royales reg pressures and they told me they're setting them at about 125bar for the .22
As long as you get the desireds velocities and accuracy you shouldn't be worried at all

Here is a list of some of the uncommon/US version o'rings if needed.

Also #3....... It may be easier to unscrew it with the stock on. You will get some leverage this way especially if it is the first time off.

"Dirte"You do not need to remove the barrel just to change the regulator. You can remove the the foster fitting (silver then the black fitting in front of the regulator). 

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​when I do it on my boss i prefer to remove the barrel and keep the foster fitting assembled with the black part to avoid any leak with the valve (dust etc..).
anyway both options work.

Glad it worked well for you.

Congrats on getting the regulator in, lot of good info on this thread.....

"mcoulter"

"Imold"Congrats on getting the regulator in, lot of good info on this thread.....

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Yeah, hopefully making this replacement easier for other readers of this thread later on is a good part of my motivation. To that end, there are two small things that I wanted to note about doing this regulator replacement:

On step #4 above, nothing ever vented when I removed the action screw from the block. But I did get a small POP from trapped air escaping when I plucked the old regulator out. Also, it took a bit more force and wiggling to get the new regulator in than I had expected. After putting it all together I shot 6 pellets or so into my yard to make sure it felt "right". In fact my gut tells me that it might be shooting a little bit hotter than before.

I'm also VERY impressed with how well machined all the parts were. The fit of all the threads, o-rings, etc. was just outstanding. While I occasionally wish I held off for one of the newer FX models with bells & whistles, I think there is a lot to be said for the simplicity and functionality of the Royale! (my 2-cents anyway)

;-)

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I just bought a 500 Royale as for me I don't need all the bells and whistles, just wanted a good shooting Airgun.


Let us know the chrono results once you have them! Keep in mind the reg may need a few hundreds rounds or so to settle down, so i wouldn't be worried for a 20-25fps spread at the begining, good work!

mcoulter here is a Chrono shot of only my 3rd mag through my new 500 Royal using JSB 25,39's, I'm happy and waiting to see what it does after a few tins thru it.