I want to build a SBR version of the Colt Enhanced Patrol Rifle.

Gonna start with a Colt 6933, the B5 SOPMOD stock is of course easy.

But I need to know which Centurion Arms MLOK rail I need. I'd like it to complete seat behind the front sight, sorta like a Colt 6945. I've seen rails where they extend under the front sight and that's not what I want. Trying to keep this one lightweight.