Look at it with a magnifying glass. Does it have a serial number "etched" in it? it will be on the bullet end. You may know this, I am not being condescending.
I have a old model single -six from 1970 and I am missing the LR cylinder--if this fits???-i'll take it if I am in time???or anyone reads this...
thanks,russ
Fyi Russ, of I'm reading the title correctly, 22 mag cylinders are being offered. I have an om single six 22 mag and bought a slightly longer 22lr cylinder, then had it fitted.... works great..... good luck!