Hi guys,
 
I was looking at completing my AR build using a Stag Model 3H upper (ban compliant of course  ).  At any rate, in the specs section it lists the pivot/take down pin size as: small .250".

Is this not a standard size or is it a proprietary size to fit only certain/Stag lowers?  I want to fit it to a NFA lower and want to make sure I don't have fitment issues with the pin. Here is the link to what I'm talking about   https://www.stagarms.com/model-3h/ 

Sorry for the stupid question but I'm still learning about these things and any insight you can give will be very much appreciated.

Thanks for any help you can offer.

.250 is standard.

Colt, for a time, made .315 sized ones. Those were non-standard.

Thank you azmaveth. Your help is much appreciated.