Stock Screw threading?

[ujiro]

Hey, tried to search for this one but to no avail.

I have a Socom Gear Socom Ace stock, but it didn't come with the washer and screw to actually attach it to the gun lol.

So, I was wondering if anyone knew the threading on this screw that screws the stock into the spring guide? I suppose I could just bring a spring guide with me to the crappy tire and figure it out, but I won't have a chance to get there for a bit, so I figured I may as well ask to see if anyone knew, and then the info would be available for anyone else in my position!

Also, if someone knew the inner diameter of most of these buffer tubes, that would be awesome as well. Need to know what size of washer to get.

Thanks for all of your help.