A little project I have been working on ... a self regulating port pressure gas plug for the M14/M1A type rifles.
This should allow virtually any weight/powder combination including "light mag" commercial loads to be used out of a otherwise standard M14 type rifle.
Nothing to complicated. Similar systems are used in power control systems using pneumatics/hydrolics to control over pressure. Steam engines also used a similar method. I just adopted it to work with the M14/M1A rifles. The unit itself is small, doesn't sick out all that much more then the original gas plug (consider everything on the right side (narrow shaft) is to scale to the rest of it based on my M1A gas plug).
Proper 2D drawings to follow, once I redo all the math to check everything's ability to work properly.