So the idea here is that there are many Regulating gas blocks and even carriers on the market. But the term is a little misleading. for example, if you put a suppressor on your AR, you will need some way to adjust the gas system. The is because the extra barrel length causes an increase in BCG velocity. This puts extra gas in your face, rips extractors off of cases, creates more bolt-bounce, and can even rip cases apart (thereby decreasing reliability), and just pounds on the service life of the components involved in the auto-loading process.
Adjustments are typically done by an adjustable gas-block (called a regulating gas-block), where one may turn a valve of some type to limit the amount, of gas the modified gas system is no emitting. But what happens when you change loads, or take the suppressor back off? You no longer have enough pressure to properly actuate the bolt and carrier.
Lately we've been tinkering with a few ideas (none of them have any practical real-world value... as of yet) to create a truly SELF regulating system. One idea is to put magnets in the buffer system. That is, the faster the buffer goes, the harder the inductive force of the aluminum buffer tube and the magnets in the buffer fight against it. The other idea is below.
The idea here is to not only direct the gas behind the gas rings, but also in front of them. creating an equal ratio of gases on both sides of the bolt, regardless of how much pressure of the gas is applied. (or regardless of the AMOUNT of gas that is applied). SOOOoOOo if you have a light load, the ratio is the same as your bear-killing loads.
There are a lot of issues with this approach, most of which stem from the drastic increase of required gas to operate this system. The will drastically increase gas erosion, gas to the face of the operator, etc. However, we would still like to test if the effect is "self-regulating".
The way the modified bolt carrier group above functions is simple. There is a new hole drilled in the gas-key and a new hold drilled in the carrier, just in front of the bolts gas rings. Next, the top gas port on the carrier has been welded to allow for more pressure to build up in front of the bolt.
this will obviously require a much larger gas port to be drilled in the barrel. Also the test will need to be very well though out to actually test the potential effects. A high-speed camera will be set up to measure bolt velocity. An adjustable gas block will be set to just enough to have a standard BCG operate correctly with a standard load. measurements will be taken, then a high pressure load will be fired and the amount of bolt velocity increase will be calculated. Then the same test will be performed with the modified BGC.
The three pics represent a few ideas on Self-Regulation or, automatic regulation from the buffer system. One of these ideas is only designed to effect bolt bounce. that is the magnet in the buffer. The idea is to precisely delay the weight in the buffer to combat the bolt bounce by induction. the other idea, is engineered to completely reduce bolt carrier group velocity, by providing more resistance through induction. The faster the buffer (now completely replaced with magnets) is going the more induction it creates, thus the more force is acting against the linear motion of the carrier.
This is a Precision Armament Muzzle device (That stops the rifle dead, it's great!) however it's been modified to also compensate for the rotational forces caused by the projectile torquing the entire rifle counter-clockwise from the perspective of the shooter. the fins are titanium and are designed to create a sort of turbine to harness the exhaust of the compensator, counteracting the torquing effect.
I set up a wood and caster shooting rest to allow for torsional movement. I used a live center for lathes as the back stop for the AR. Using an iPhone's slow-motion capabilities (240fps more than enough for this test) I was able to determine that the 55 grain stuff moves the rifle around 5 degrees (from this jig) counter clockwise from the shooters perspective. With the the wings placed on the compensator, the rifle move 6 degrees average clockwise. I have not yet tested the heaver 77gr projectiles yet, but I have a feeling that this setup should keep the rifle fairly close to neutral!