IZH-46M Transfer Port O Ring Solution

Just got one

maxtrouble: Thanks for the info, that's very helpful!

I smithed a couple of these for shooters 10 years back when they were all the go here in the UK, both sorting the O ring blow out issue and fitting the slightly small diameter, stainless steel reservoir (at that time from B&M products) The mod sent a decent OEM 46M from 475fps avg to 505 fps …
The mod for keeping the O ring in was quite simple.
I peened the outer diameter of the O ring groove (not barrel side) until achieving a slight deformation of a few thou inward until slightly over the edge of the O ring (a tiny projection) at 2 points around the diameter.
Anywhere around the diameter, but roughly opposite of each other.
Made installing the O ring only slightly more tricky, but completely curing the blow out issue…

For those who may not know what the "blow out o-ring" issue is with these fine pistols: a pair of rubber gaskets (o-rings with one flat side) seals both sides of the triangular block (visible in two photos above) that transfers air from the compression chamber to the barrel. If the pistol is fired without latching this transfer block in place, one or both of the gaskets will be blown out of the triangular block and they are notoriously difficult to find. If the original gaskets are used, this will not happen if the transfer block is properly latched before the pistol is fired. I have no personal experience with the replacements from the o-ring store but if they work as well as the originals this is another good reason to get an Izzy.

This pistol is on my very short list to purchase!

Great fix! Thank you for the information!

maxtrouble said:

I managed to lose the two o rings on the transfer port arm for the pistol on my second shooting session. I contacted Air Venturi support to see what the replacement parts are. Stacey from Air Venturi told me to use M5x2 o rings that are available from any o ring dealer. Purchased them from The O-Ring Store and they showed up in two days. Installed them in the pistol and they are perfect.

I can now recommend purchasing one of these pistols. All the seals and o rings are available so have at it. They are a hoot to shoot and will chuck a 7 grain pellet at 450 fps until you blow out the o rings or get tired.

Baikal IZH 46M SSP

Baikal IZH-46M Match Pistol For most new shooters, this is the first serious match pistol. Single Pump Pneumatic Air Pistol. Max. Velocity : 470 Fps. Caliber : 177 Overall Length : 16.8

canadashootingsupply.ca

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What do you think about going with a square profile O ring, with the same dimensions? I am thinking this is even closer to the original o ring...

Phraint - Did you ever get to try the square O-rings from McMaster-Carr? They look like they would work but maybe they're a little thick.

I ordered some of the square O-rings last night, will measure and compare to OEM rings when they come in.

jkingrph said:

I ordered some of the square O-rings last night, will measure and compare to OEM rings when they come in.

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Please let us know how they work.

slowman said:

Please let us know how they work.

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Hopefully that will be awhile. If I do not blow out or loose the ones currently installed they will remain backups. I can take my calipers and compare to OEM seals though.

I got the rings in from mcmaster today. They are square cut on the side where the OEM rings are cut an an angle, as to fit into a dovetail. My measurements are OD, ID and thickness. Oem =94,4.98,2.14 the McMasters are 9.1,4.9,2.02 The OD on the OEM rings are for the greatest diameter as it was virtually impossible to measure on the smaller taper side. Also measuring with a hand caliper on a soft o ring is not the easiest either.

Just purchased my AV-46M from New England Airgun! So far Love It! From Russia with Love!

maxtrouble said:

Did you try them in the pistol? The ones I purchased seem to work as well as the OEM o rings.

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No I have not, Which ones did you try?