I've bought, sold and tried almost every variant of No.4 no-gunsmith type bases and mounts in existence and the only ones I recommend are the GE Fulton steel Picatinny base and Armalon aluminum base. They are both English manufacture, superb quality, use rings of your choice and leave plenty of room for correct eye relief. The Fulton is my favorite of the two because I prefer steel. The Armalon is great if using a lighter telescope.
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