Ssae. Far nicer than the trigger tech I put in a stag 10... Which also won't light the hirtenberg 308 reliably. Love the TT diamond in my precision rigs but geiselle for a semi.
I also have the standard adjustable one on my AR and have not had issues with it in hard military primers. I tried a GI trigger with JP lightened springs and they were too light. Triggertech worked on them.
308 or 223?
Base on Geissele advice, it’s possible to have some compatibility issue in some trigger design that are design for the AR15, the lower receiver don’t have the same dimension ( trigger) housing, and the BCG don’t have the same height as the AR15, in fact they don’t recommend their Single Action Trigger, better to email them for clarification to the manufacturer you decided