LaRue Tactical 34mm to 30mm Half-Ring Inserts Black. ...No problem. These half-ring inserts convert any LaRue 34mm ring to 30mm ring. Simply drop-in between the scope and rings then torque all the ring screws. Done. Specifications for LaRue Tactical 34mm to 30mm Half-Ring Inserts: Manufacturer: LaRue Tactical Condition: New Color: Black Last Chance: Yes Package Contents: LaRue Tactical 34mm to 30mm Half-Ring Inserts LaRue Tactical LT151: 34mm to 30mm Half-Ring Inserts Black