I have made them over the years using internals from high quality ($4K+) digital hearing aids. I personally use nothing else but these. They require best quality impressions and must be programmed accurately to do their job and sound right. It is imperative the mics are positioned in the helix, not on the faceplate or you will get a lot of wind turbulence. I programme them usually with both neutral volume and with a boost setting for when you want to hear softer sounds/voices at a distance. This boosted setting does not lift the level of the firearm's report.
This type of custom item will never be cheap if made and programmed properly. Triton Hearing sell these for $1300/pr which is actually cheap given the electronics inside. If you want some, make sure they ask advice from Chris at the Hawkes Bay clinics as to exactly what to do. They are a "special order" item, not a routine hearing aid.
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