I hesitated on posting this because I can’t duplicate at home what I do at the range, and I certainly don’t want to be responsible for you buying this, then it won’t work as I advertised.
As I mentioned in that other thread, I use a CED 7000, and it will register hammer strikes on Colt 6920s and 6721s.
That 7000 is a couple years old.
I’m no expert with the thing, and a friend does all the set up; I just push buttons.
The 7000 I have here at home was bought at the same time, but is almost NIB.
I could only get it to register hammer strikes while holding the 7000 no farther than about 10" from the magwell.
The other one we use at the range will register hammer strikes (as I said before) when worn around the neck, on the wrist, or held near the buttstock/shoulder intersection.
It’s possible my technique was AFU as it’s difficult to manipulate the 7000 and the gun in certain configurations, or maybe there’s a setting I failed to set-up correctly.
Maybe you can find one to borrow, and give it a try prior to purchase.
Edit:
Something I just thought of.
I was doing this at home with an empty chamber.
At the range, I use dummy rounds - homemade and/or store bought.
Not sure if a round being in the chamber makes it louder.