Originally Posted by
Sandman
I'm not trying to be too critical here but several things you say don't match up or make sense. No judgement, not everyone is fully versed in servicing mags and we are all here to learn or teach a thing or two.
We don't rebuild reg piston assemblies. You can't take them apart. I suppose you could but it would be ruined. So my assumption is you meant the regulator pin assembly. Very different than the reg piston.
The pins are easily rebuilt. You can either remove the clip and replace the two #779 orings or you can manage to carefully do it without removing the clip. I prefer to remove it.
You also don't need to separate the halves to swap a level 10 oring. Besides that, you don't swap orings with level 10's. You swap carriers if you have a barrel leak. Same oring. Smaller carrier. If you are on the smallest carrier that you have, then you can start with a new oring and hopefully go back to a larger carrier to start sealing the barrel.
It is possible the halves don't line up perfectly. Valves that have been taken apart and tightened together many times can wear past the alignment marks. Typically it is minimal and you can simply align the marks and continue to use the the valve. The valve body oring will still seal the two halves. This isn't something that happens after one time taking it apart. One issue that can keep the halves from aligning is the wrong oring for the valve body halves. Make sure it's the correct oring and the proper hardness.
If your valve halves turn too far then you will have an issue with aligning the z-lock pin and being able to get your banjo bolt in the valve.
So make sure you are using the proper orings first. Make sure your reg pin is rebuilt properly and the c-clip is secure. Change carriers for a barrel leak first. Do not change orings. Take the oring out of the carrier and move to the next smallest carrier until you have no smaller carrier. Only then start with a new oring. If the halves are turning past the alignment marks just stop at the marks and leave it. The valve will most likely still seal. If the halves are too lose to seal then you'll need to get the valve to an expert to determine if it can be salvaged or if it has worn too much. Several people including myself, Tuna and Pinky can help you with that, if that's the case.
Go forth and tech more!
Sandman