So thats what thats for!
 

With the other BP thread and sabotloader saying that adjusting the firing pin bushing my way, wasnt the way. I did some tinkering and figured out how CVA adjusts it.

Anyone shooting a newer model CVA will see a rubber o ring when they remove the firing pin bushing.

DING DING!

Remove it and replace it which a thicker o ring until you've adjusted the firing pin enough to seal up the primer blow by.

I used an o ring that was double the thickness of the factory o ring and it fit perfect and was able to tighten it up all the way :rock:

Sell the o-rings to CVA. :lolabove:

LOL!! Funny.

Here We go! Got some pics.

The O ring on the Right is the original. O ring installed on the Firing pin bushing is the new o ring to adjust head space.


Reinstall bushing with new o ring and snugged her up tight. Perfect adjustment.

MountainDevil54

I think you may be wrong and misguided in your efforts here. The factory "o" ring is used to seal the threads of the bushing from blow back debris in the reciever frame. It is not intended as a bushing stop or head space adjuster. When the bushing is installed as designed it bottoms out on the reciever frame, which stops its rearward movement when the blow back pressure hits the nose of the primer. It also stops forward movement when the hammer stikes the the firing pin. Inserting a thicker "o" ring will not stop the metal fatigue the threads of the bushing will may possibly incurr as it is driven rearward by blow back pressure.

As you suggested else where if you were to replace that 'o' ring with a metal shim, or even a metal shim between the base of the firing pin bushing and frame - then you might be on to something.

A simple e-mail to Mike Bellum with this information would confirm what is being discussed here.

If a simple "o" ring were the answer to the problem you think Mike might have used that a long time ago instead of developing metal spacers, then again why has he not done that for the CVA line.

Another thing I would ask you to do - submit this thread to CVA and see what they say. I could be wrong but I would need CVA to say so.

X2. the larger o-ring is a short term fix.. metal spacers are the way to go..Ray

there is just no pleasing some! :D

Already shown Don at Western and Mike Bellm, they both agreed with the first way i did it. Mike said he could make some washer shims if it came to that. The thicker washer works perfectly and allows you to tighten down snug.

Great! as long as CVA and Bellum backs what you are telling your loyal following to do. Just not sure, ya I am sure, I would use rubber in that spot for that job.

Just as i suspected, i removed the o ring and screwed in the bushing bare back. The bushing goes in to the point where you cant screw it in anymore due to the firing pin being in the way. The O ring does in fact seem to be the head space adjustment and just like you said SL, keep debris out. With the head space adjusted correctly for the primers you are using, debris will be no issue at all.

MD

Good enuf - hard to believe that CVA would do that with a rubber 'o' ring. After shooting and when you remove the primer is there an impression of the screw driver slot on the head of the primer, running from the firing pin impression?