[Krugermeier]

Scenario 1:
The gun will chamber properly, trigger is pulled and released, the gun fires properly. Cartridge ejects properly, and new round is chambered. The trigger does not reset to cocked position.

Scenario 2:
The firearm is empty, and the trigger is not in the cocked position. The trigger is pulled and held down as the charging handle is racked. The trigger is released. The trigger has not been placed in the cocked position.

Hardware:
Cheap $20 Anderson trigger

Cheap $350 PSA completion kit (20” upper, BCG, buffer, A2 stock, rifle length tube and spring)

Diagnosis:
My first thought is that the trigger hardware is faulty.

Other possibilities are that there is not enough gas traveling through the gas tube to send the BCG back far enough against the spring and into the buffer tube to reset the trigger. This could also be a combination of issues, such as buffer/spring too heavy.

What to change:
I would start with replacing the trigger, before swapping the BCG or spring/buffer.

 

[98cwitr]

If you manually try cocking the trigger with the upper off, what happens? If you then cycle the trigger, does it reset? Sounds like the sear is bad, but can't tell from the pic.

Honestly, you shoulda bought the PSA fully assembled lower. $150 with stock and trigger; but at this point, I'd swap it with a CMC trigger and call it a day.

EDIT: I also have a Rise trigger which is ALMOST as good as CMC and considerably cheaper: https://palmettostatearmory.com/ris...rting-ar-15-10-curved-single-stage-drop-in-trigger-gadsden-ra-140-dtom-awp.html

 

[Hkmp5sd]

Sounds to me like you are having a hammer follow issue. It is possible that there is something radically wrong with the actual machined trigger components, but I would say that is pretty rare. Since the ejection and feeding you mentioned is normal I don't believe you have a gas problem. More than likely its a disconnector problem and very easy to fix. Does the disconnector appear to be functioning properly when you have the upper removed and work the trigger/hammer by hand? Could be the disconnector spring is missing or installed wrong causing the disconnector to be stuck "open" or in the rear position. My bet is your issue lies there.

 

[Chase214]

Have you tried a diff trigger