Tuning O-rings for pr900w stormrider xm1 .22

[xyon]

Hi all,
I've googled without luck to find the breech o-ring size for a Stoeger xm1 that I recently acquired which is missing the said o-ring. Like the Diana Stormrider, this rifle based on Snowpeak PR900W. I need the size for the .22 cal, if anyone knows? Also I will replace the 2 skinny o-rings on either side of the transfer port as they have been cut up when the barrel was installed.

 

[nervoustrig]

On the Snowpeaksports download page, they have several exploded diagrams available. 

http://www.snowpeaksports.com/download.html

The one for the PR900W unfortunately has only Chinese labels, and worse still is that the PDF appears to have been saved as an image rather than as searchable text one could copy out into a translator.

But not all is lost. SPA has a lot of overlap between models so grab the one for the PP800. I think you'll recognize a lot of the parts from your PR900W. Notice for example for the breech O-ring they give "D8.5-1.5". That signifies an 8.5mm OD and 1.5mm cross-section...thus a 5.5mm ID (5.5mm = 0.22 cal). So you would order a M1.5 x 5.5 replacement.

In case you're wondering, yes they are turds for listing metric O-rings by the OD.

 

[xyon]

super, thanks nervoustrig

 

[Vince]

Following up on this thread; anyone know the o ring size of the skinny ones on either side of the transfer port? Same deal here, they got destroyed when assembled in the factory..

 

[Vince]

Nervoustrig to the rescue, via a pm, but thought I'd share here as well for reference when other people might need replacements;

Hi Vincent, the two wispy O-rings that go on the barrel tenon are M0.8 x 8. It's an oddball size...usually the smallest cross-section we run into is M1 and these are a bit thinner.

 

[Vince]

And from Pyramydair;

Hello Vincent,
The barrel orings should be 7 x 1 .

Thanks again,
Ted