Undergassed could have extremely similarities to properties being an overgassed which include FTF. Possibly you have got bolt bounce Or maybe the trigger is outrunning the provider. They might have bolt bounce issues like actual machineguns do. There can be troubles with timing if the "M16" bolt provider or other https://forcedresettriggerrarebre58775.blogofchange.com/35335268/everything-about-rare-breed-forced-reset-trigger