O-Ring QRBP CVA?

[BlackPowderGuy (AJHS)]

I am getting a fair amount of fouling on the firing pin area in my Optima, using Federal 209A with BH…I’ve read a bunch of posts on here about using o-rings…I just want to make sure I understand, you place an o-ring in the primer pocket- just lay it there or push it in? Can somebody who does this post a picture of what the breech plug looks like with the 0-ring in place. Any o-ring brand/size particularly recommended?

 

[southdakbearfan]

You have it correct and it makes a huge difference. My fouling around the primer and on the firing pin went to zero. They last a surprisingly long time.

Here is a thread with different types.

https://www.modernmuzzleloader.com/threads/o-rings-for-shimming-primer-pockets.35877/

 

[phalanx]

Here's another. Posts 2 and 5.

https://www.modernmuzzleloader.com/threads/cheddite-primers-with-blackhorn-209.41927/#post-389989
I push them in using a spent primer or flat side of a drill bit.

 

[deermanok]

I bought some of those o rings to use on my Optima pistol.
After the first shot, I reloaded and discovered that the hammer wouldn't cock back.
Took my pocket knife and pried out the o ring. The gun would cock fine again.
I don't know what caused this problem?

 

[ronlaughlin]

The rifle won't cock because the locking mechanism isn't fully closed, because the o-ring made the head space too small. Snap the action closed with a little vigor, compressing the o-ring a little more, may fully close the action. A shorter primer may help.

 

[deermanok]

I know that I closed the action good but I will experiment with a different primer.
It's just odd that it worked fine for only 1 shot.

 

[rangerod]

I also use the o-ring in my Optima. Never had an issue with closing the breach. Problem solved.

 

[MeatMachine]

I bought some of those o rings to use on my Optima pistol.
After the first shot, I reloaded and discovered that the hammer wouldn't cock back.
Took my pocket knife and pried out the o ring. The gun would cock fine again.
I don't know what caused this problem?

Screw the firing pin bushing in a little more.

 

[michiganmuzzy]

I use the orings and have to slam shut my Accura on them.

 

[MeatMachine]

I do to but if that doesn’t work Deermonuk can just tweek his firing pin bushing in a bit.

 

[deermanok]

Screw the firing pin bushing in a little more.

I do have it backed out a touch.
I'll snug it down good and try another o ring. Maybe that's all it needs.

 

[MrTom]

When using a fresh o-ring its not uncommon to have to snap the gun closed with just a bit of authority the first couple of shots.

 

[MeatMachine]

I do have it backed out a touch.
I'll snug it down good and try another o ring. Maybe that's all it needs.

I would turn it in about ten degrees at a time until you find the sweet spot.

 

[MeatMachine]

When using a fresh o-ring its not uncommon to have to snap the gun closed with just a bit of authority the first couple of shots.

This is true but deermanok sounded like he had a different problem.

 

[deermanok]

This is true but deermanok sounded like he had a different problem.

Exactly, my gun wouldn't cock with the oring in place. The gun worked fine after I removed it.

 

[michiganmuzzy]

Exactly, my gun wouldn't cock with the oring in place. The gun worked fine after I removed it.

I tried my Accura with the bushing screwed out just enough to stop blow by, i just never felt comfortable with it that way. It never moved or gave me any problems, i just kept worrying about it, til i went and screwed it in and went back to the o-rings.

 

[deermanok]

I tried my Accura with the bushing screwed out just enough to stop blow by, i just never felt comfortable with it that way. It never moved or gave me any problems, i just kept worrying about it, til i went and screwed it in and went back to the o-rings.

I'll have to fool around with it soon as I get a chance.

 

[BigBoresmokepole]

I'll have to fool around with it soon as I get a chance.

Cva makes a shim kit to shim out the firing pin housing I had blow by . Put about. 06 or until you have about .04 crush on the primer length no more blow by the breach area stays nice and clean now. Also put a new firing pin and spring and new bushing. You need a venire caliper to get the proper depth of head space for primer pocket

 

[MeatMachine]

I used a shim kit years ago for my accura v1 but switched to the primer pocket oring sense then because the centerfire frames don’t have a adjustable firing pin bushing plus I think it’s cleaner. My cva wolf has the 209 pocket oring.