9mm's take a different hammer at least Colts do.
This is a PSA 9mm Hybrid designed to take Glock mags. I just re-checked the PSA site and it states "Accepts standard AR-15 fire control groups, bolt catch, take down & pivot pins, springs & detents, safety selector as well as stock, buffer tube and grips." I replaced the triggers in my Colt 6920s with Geissele SSA triggers and used one of the factory Colt triggers for this build but that shouldn't be an issue.
Originally, I thought I messed something up with the buffer (factory KAK pistol blade kit) but it could very well be something with the trigger. Once I pull the charge handle back, I can charge it over and over normally but once I fire a shot, it binds and is very tough to charge.
