CVA BH209 Breech Plug Blowback

[UTGrad]

With my first generation Accura with the bolt breech plug, to stop blow back I backed out the firing pin assembly screw enough to where the action would snap shut and there was very little space between the primer and the breech face.

I just got an Accura MR with the BH209 QRBP and my primers are pretty black when fired. What solutions are available with the BH209 QRBP to stop blowback? Honestly the gun shot fine today even though there was some blowback so I’m wondering if I’m making a big deal out of a non issue.

 

[lwh723]

Depends on what weather you hunt in and how far you want to shoot. Leakage usually means higher velocity spread which will bite you at distance. And it can lead to misfires in colder weather.

I think there's other solutions out there that may help with leakage, but I know this one will give 100% seal.

https://www.arrowheadrifles.com/product/cva_qrbp/

 

[MrTom]

Without buying a new breech plug, you can try different primers. The Winchester primers in the blue box used for shot shell reloading are quite long and often are long enough to stop this. The small rubber o-rings some people use can be inserted in the primer pocket to help alleviate this issue too....cheap, effective. One o-ring will go maybe 20-30 shots depending on load and they come 100 to a package for little of nothing and take 5 seconds to install. The firing pin shims can be used too if you can find any in stock at CVA.

 

[UTGrad]

Anyone know the size of those o-rings?

 

[MrTom]

https://www.mcmaster.com/9262k611

Here's a link to order them. $5.00/100 Lots of shooting here.

 

[D55]

I shared this with another member. triggershims.com he makes shims himself and if you have dimensions would most likely be able to make you what you want. I have done a bunch of trigger jobs on Ruger DA pistols with his shim and spring kits. Just a fyi for those who might have need.

 

[UTGrad]

https://www.mcmaster.com/9262k611

Here's a link to order them. $5.00/100 Lots of shooting here.

Thanks. I have read reviews that these melted quickly due to the lower operating temp. Can you confirm if they last?

 

[UTGrad]

Just ordered the o ring from Amazon. I’d like some feedback from folks that use that specific o ring. I have a few boxes of Federal primers and don’t want to switch just yet.

 

[Busta]

Just ordered the o ring from Amazon. I’d like some feedback from folks that use that specific o ring. I have a few boxes of Federal primers and don’t want to switch just yet.

What o-ring did you order? Do you have a link?

 

[ronlaughlin]

Have no clue which o-ring UTGrad ordered, but this O-RING at amazon looks good. A lifetime supply for only 20 bucks.

 

[michiganmuzzy]

Thanks. I have read reviews that these melted quickly due to the lower operating temp. Can you confirm if they last?

I've been using them for a while and never had a melted one. They do deteriorate tho. I get 20-40 shots before i i replace it.

 

[Travis299]

The blowback from the primer can foul the firing pin assembly in addition to being wasted hot gas that is intended to ignite the powder charge. My solution to this problem is the O-Ring in the primer pocket which provides a seal for the primer. This O-Ring was recommended on the BP rifle forums and it really works. When using this O-Ring make sure that the firing pin bushing is flush with the receiver face and when loading a primer point the action down and close with a firm snap. I find that the O-Ring lasts 10/20 shots before needing replacement. If your fired primers are less than squeaky clean I suggest that you try using the O-Ring. https://www.mcmaster.com/9262k611 (100) or https://www.amazon.com/gp/product/B...1?smid=A3FZE1HJFVXQMI&psc=1&tag=forumyield-20 (500)

 

[Busta]

That's the right size, same material and durometer.

I've been using them and others since I came up with the idea in 2008.

 

[UTGrad]

I ordered the one everyone is recommending from McMaster.

M1x4.5 Buna-N O-Ring, 70A Durometer, Round, Black, Buna-N, 4.5 mm ID, 6.5 mm OD, 1 mm Width (Pack of 100) https://www.amazon.com/dp/B00NQX605M/ref=cm_sw_r_cp_api_i_1zYlEb7FGFA7F