Editorial Product Review:Item Description:Bounty Hunterandreg; 4-inch Magnum Coil While a standard coil is great for finding large objects that are deeply buried, the 4-inch coil has a narrower field fo detection - enabling your detector to separate objects more efficiently. The 4-inch coils shallower detection area makes it ideal for prospecting in difficult, high metal areas since it allows you to more easily discriminate valuable objects from refuse. In addition to allowing the precise pinpointing of objects, a smaller coil lets you probe tight spots such as corners and crecives.
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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Is it Worth it? 100xs Over!
When i first used this it made a difference right away. How did i know? My Friend has the Same MD as i Do (Tracker IV) and we were metal detecting next to each other. I looked over some spots he already went over and Still Found stuff he missed! Also practiced with the MD with the New coil and it is now able to detect SMALL nuggets of Gold, the regular Stock Coil is not able to detect it. This Coil also helps with Pinpointing to where the Item is. I would suggest buying this coil. Im buying another one for my Girlfriends Tracker IV.
Customer Rating: 
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4 inch search coil
This coil is easy to change and easy to use, I had a lot less pop top hits. I am pleased with it.
Customer Rating: 
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WOW! I am amazed with this coil!!
I am most interested in using my metal detector for hunting minerals that are conductive, like pyrite and galena. I bought a bounty hunter tracker 4, and was rather disappointed in the performance. For example, looking for pyrite, the specimens needed to be rather large - greater than one and a half inches (along one dimension - they could be thinner, though) to be detected. However, I then put this coil on the detector and WHOA! I could then find cubes that were as small as 1/2"!! That's amazing detectability from such an inexpensive instrument.
For those of you unfamiliar, minerals are inherently higher resistance than plain metals, and are therefore harder to detect - you need a larger sample to create a response.
Since the coil is smaller, its depth range is much less, so this is mainly for finding smaller items near the surface.
With this coil I can find some rather small metal objects too! Objects like a sewing needle. So, yes, this thing can help you find a needle in a hay stack. Just make sure you spread the hay out thin. ;-)
Customer Rating: 
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Bounty Hunter 4 inch Gold Nugget Search Coil
Got this coil and it is just what I needed. Gives very accurate detection, also makes a good set with my Bounty Hunter 10 inch search coil. Works great and arrived in no time.