I had the trigger put in professionally at a local GS. It took alot of work and fanagling to get everything in properly. It seemed to be due to the Apex trigger spring being larger/wider than the factory spring and not seating flush. After a great deal of work, it was put together.
Wait, you had it put in professionally. So how do you know it took a lot of work? Is that what the smith said?
Know the status of your weapon
Keep your muzzle oriented so that no one will be hurt if the firearm discharges
Keep your finger off the trigger until you have an adequate sight picture
Maintain situational awareness