I have a B&L Balvar 8A 3x - 8X from the 1970s that has no in scope adjustments except for magnification. The bases are adjustable V grooves for both windage and elevation. One base is on a 98 Mauser 30-06 and another base is on a Ruger #1 in 300 Win Mag. I use the scope on either rifle with no loss of zero. Scope change takes about 1 minute or so.
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