If you purchased a DPMS Oracle or ANY complete AR-15 rifle it will forever be a RIFLE! Now you could put a brace on it but it will never be as ergonomic or as sturdy as a true rifle stock and because it was originally configured as a rifle you cannot have a barrel of less than 16” on it without an SBR stamp. Therefore adding this device and a brace would be a step in the wrong direction.
Only If you have the sbm4 brace. It goes in between the brace.