Yes, I agree what the other members said, plus in addition you should check the trigger, disconnector and hammer to make sure there are no other foreign objects are stuck there.
The best way to make sure is to remove your hammer and trigger from the lower receiver, clean, inspect, lube and install.
Also do a function check (make sure your weapon is not loaded first) by cocking the hammer, then pull the trigger holding the trigger back, hold the trigger back while cocking the charging handle, then release the trigger, you should hear the disconnector click, put the safety selector on safety, pull the trigger (should not fire), rotate the selector to fire position then fire the trigger.
Here's a good video instruction on removing and installing the hammer and trigger, they're showing an aftermarket trigger but the installation process are the same as the factory trigger group.
You were correct, had a bushmaster at one time so was confused, pulled everything apart, cleaned it and put back together, now a very happy camper. I also bought a new 1911, and love it, colt side of the safes keep growing.