I have a Raac mka 1919, 12ga mag fed, gas operated, auto loader. It began as a m16 style shogun, but I have done a few things to it
The gas system seems to be sensitive. As built from the factory, it would only cycle heavy loads. After installing the tromix gas ring, now it will only cycle birdshot
/ light loads. Anyone have any experience with finding the "sweet spot?"