PDS is actually out and has been tested to be very effective against chops. JAM bolt release date is unknown and hasn't been tested. Get PDS done at ICD.
pds is way better than any bolt just make sure you have these tiny little o-rings in you gun when you take off the cover for the pds there will be a spot at the top for a tiny o-ring and that is you ball detent and you two of them one for each side