specs for roll pins on AR-15 lower

[OCB]

I assembled my Zombie lower from the group buy, and I'm not happy with the bolt catch roll pin (it's actually a spring pin). Does anybody have the specs (length and diameter, plus tolerances) for this pin? I want to order a bunch from McMaster and find the smallest one within the tolerance range.

Thanks

**EDIT**
I tweaked my google search parameters and came up with this site, if anyone also needs the info:

http://www.biggerhammer.net/ar15/pins.html