I just got mine yesterday and it was my first PSA rifle as well and couldn't be happier. For a $400 rifle it couldn't be beat. I also got a nitride bcg.
My 20" handguard has a gap too. Don't know why. I used a hair dryer and heat up the handguard and zip tied it and left it to cool. It helped but still a gap in the middle of both sides.
hondata70 I honestly don’t remember, but PSA is usually pretty quick at shipping items that don’t require an ffl. Within a week or two would be about right.