If you have a recent SA, get the Smith. If not, get the ARMS. The ARMS won't fit the groove of my receiver and when I did mount it it caught brass between the mount and the op rod. Although the Smith caught rounds too, it offers a little more room and I am changing out my bolt parts.
The best price I found on the Smith is to get it directly from them Smithenterprise.com. $225
Best price on ARMS is Fulton Armory. $170
HTH
The best price I found on the Smith is to get it directly from them Smithenterprise.com. $225
Best price on ARMS is Fulton Armory. $170
HTH