Well looks like there are a couple AR pros in the mix here… the ideal solution would involve a mechanical break in the linkage between trigger and hammer… so not something that blocks function, but something that enables function… instead of putting a pin in the way of the trigger or blocking linkage from moving, a pin is placed to complete the link. That way simple brute force can’t possibly overpower a blocking pin and cause the weapon to fire.
It’s been suggested that I create a modified trigger group for the PS90 that contains the reader and everything, then run an antenna up from there. It’s not always that simple, and the best antenna designs are difficult to get good reads of these pesky implants.
The question might want to start with include;
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Which frequency? 125khz puts up with a little more metal interference but antenna sizes are much larger than 13.56mhz.
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There are also NFC rings now which might expand options for users (they are 13.56mhz of course).
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Judicious use of “magnetic absorber sheets” in the antenna design might be a good idea. PDF1 PDF2
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If this is a one-off project, then consider developing a reader antenna to work with the flexNT vs the x-series… better performance. If either of you want to commercialize this, then design for the xNT or xEM since injections are a much easier sell than scalpel work.