Hi All
Just completed my first build, used the following,
Anderson complete upper ( already assembled when I bought it)
Anderson lower and lower parts kit
PSA BCG
Buffer assembly from Brownells
When I fire the gun it will fire, eject the spent round, strip and chamber the next round, but will not "cock" the trigger. If I pull the charging handle it will eject the unfurled round , cock the trigger and fire that round.
Any help would really be appreciated
Thanks

Sounds like a problem with the disconnector.

Check to see the disconnector spring is smaller end up.

Did you function test the fcg?

You guys hit it right on the head it was the hammer, slight burr where it engages the disconnect it. I gave it a couple of passes with some 1000grit sandpaper wrapped around a small file. Problem solved, can't thank you enough.