go to palmetto state and buy one of their blem complete lowers for $149.95 on sale.
go to primary arms or delta tactical and buy the best complete upper in your price range.
i have 4 now in different calibers i have done that way and none have cost me over 600. and all will shoot 1.5 or less at 100.
the palmetto triggers can use a little polish but aren't terrible.
over time you can upgrade the fire control group.
Just checked... PSA- out of stock across the board for lowers of any kind. Kinda frustrating but that is the game these days... get in line and wait.