Solid advice on both BCM and “Gamer” ARs.
The easy button /LTT equivalent would be a KAC mod 2 16”.
However, BCM, Centurion, SOLGW, SIONICS, Daniel Defense and Geissele all make good quality 16” carbines with free float rails that would be great rifles for you to tweek to your liking. Noveske is OR based and make a great rifle as well.