These are for both one- and two-piece Bausch and Lomb custom mounts for externally adjustable scopes.
61-42-81: Standard Clamp Ring Assembly for Custom Two-Piece Bases except for 61-42-54, 61-42-57, 61-42-60, and 61-42-70.
61-42-83: Long Clamp Ring Assembly for Custom Two-Piece Bases 61-42-54, 61-42-57, 61-42-60, 61-42-70 and all Custom One-Piece Bases.
These are for both one- and two-piece Bausch and Lomb custom mounts for externally adjustable scopes.
61-42-81: Standard Clamp Ring Assembly for Custom Two-Piece Bases except for 61-42-54, 61-42-57, 61-42-60, and 61-42-70.
61-42-83: Long Clamp Ring Assembly for Custom Two-Piece Bases 61-42-54, 61-42-57, 61-42-60, 61-42-70 and all Custom One-Piece Bases.
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