Check your user manual regarding the gas rings. Some Turkish bullpups include two distinct gas pistons or an adjustable ring system optimized for either "Light Loads" or "Heavy Loads." Ensure you have the correct configuration installed for the ammo you are shooting.
The most commonly reported problem is the Centurion BP-12 failing to cycle, particularly with low-power ammunition. This often presents as , where the empty shell case gets caught in the ejection port, or failure to extract/eject . centurion bp-12 problems