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OregonGregg
I was thinking I could send ya the Big Red Minelab 440 to use as it has updated and pretty smart IQ Multi Freq. technology. Perhaps it might give you an edge over the last decade MF tech of the V3i to capture #20. Anyhow just a thought............anything to help ya get #20

Ah Gregg,
Already looking for a way out of that Minelab of yours -

? If you're really so uncomfortable with anything other than the CoRe - just admit it. And you can get rid of all the extra / backup / rainy day / end of the earth / walking dead / back up detectors you've bought along with the crates of lower rods and search coils and take that old CoRe with the 5" OOR mounted on it and stand it up in the corner of the room out of reach of the gnawing teeth of a growing puppy and call yourself good. (I'd hang onto the M6 with 7" detech as a complimentary option)
Just have a look-see on the storage shelves and make sure you have a couple dozen fresh AA batteries and you're good for the year. You can leave all of the detector comparison garbage behind, send your NBT to somebody new on the forum and know that you've moved onto the " I'm good where I'm at " stage of life.

No need to try and keep up with the Jones' or anybody else trying on new detectors several times a day.
Rich