Barrel twist on 187 prefix mini/ranch?

[Malamute]

A friend has a 187 prefix stainless ranch rifle and was wondering what the barrel twist rate was, anybody know?

Are the dates of manufacture available for these rifles?

Thanks for any info.

 

[X - Man]

My Mini 14 Ranch S/S is a #188 series. Has a barrel twist of 1 in 7. More info may be found at the Perfect Union.com site, in the Mini section. Also can go to the Ruger factory site.

My Ranch does its best using a 69gr or 77gr bullet.