Wolfdog,
Ya gott know up front that the SWFA scopes have NO zero stop, let alone a zero lock. Some buy special various thickness washer shims to put under the turret caps once they find their zero. You can still turn the turret UP (or Right) but not down (or Left) Me? I just used clear packing tape around my turrets and hope for the best. So far so good.
For the great SWFA prices, toughness and quality you have to give up something and that "something" is zero stops and middlemen.
So, as rugged as SWFA scopes are and a very good of glass as they have you still may want to look at Nikon Black scopes. They do have zero stops and very good glass.
Eric B.