[adamsredlines]

Are all 1919s the same? If so, what is the twist rate?
If not, whats the twist rate for an Izzy barrel?

 

[brassmagnet]

IIRC the originals were/are 1:10 twist

 

[kkkriverrats]

Standard rifling for US Caliber 30 is 1:10 right hand 4 grove, however some barrels for refurbished M1917 rifles made by IIRC Johnson Automatics and I believe some M1903A3 used 2 grove rifling which apparently provided acceptable accuracy

 

[adamsredlines]

Thanks guys!