After sleeping on it, this package has numerous layers of benefits.

If you opt for the whole package with the spring and bolt and buffer, it is a rough equivalent of a roller delayed system. The carrier itself travels something like .25" farther back and the bolt itself has a longer stroke. The net result is a little bit slower bolt opening. This reduces open the bolt under peak pressure.

The cam pin and firing pin are proprietary as the inside geometry of the cam pin is beefed up. However the OD is not altered so the carrier is reverse compatible with anything else standard mil spec.

Where the primary sound reduction happens is changing the size and location of the ports, which are traditionally located on the right side of the bolt and vent straight out into the outside air.

In some of their old tests of other products over the years left them knowing that small ports can increase sound signature a lot.

In one example, many years ago they were testing a muzzle device that had some small ports on it. With a bare muzzle the rifle metered in the high 160's. Same exact setup except adding that muzzle device that had the small ports and the sound signature increased to the low 170's.

Basically put the size and location of those ports on a traditional BCG are increasing port noise just by virtue of their existence, shape, and location.

So they moved them.