Free: Contests & Raffles.
I have bought and sold and built lots. 2 things that are very nice to have is a closed trigger guard and a screw in bolt catch. Takes 2 of the bigger issues that a lot of the first time builders I sell to have. 1 breaking ears on the guard hammering the roll pin in. 2 scratching and marring the receiver trying to press in or pound in the both catch roll pin.
Aero Precision! Nuff said!
Went with stripped lower and upper from aero.