Fill Screw for Russian

[dre4runner]

Like the title suggests, I need a fill screw for the Russian 91. My dumb ... accidentally dropped it in the bathroom sink while I was cleaning it and replacing my wick. I need the screw size and maybe hoping to get it a hardware store.

Any info would be greatly appreciated. Thanks

 

[DreamWithin]

I think it's an M2.5 x 6mm, but I'm not 100% on that.

I googled and found two US vendors selling replacements, I'm sure there are probably others as well:
The Russian 91% Replacement Parts - EVcigarettes.com
Russian 91% Fill Screw