"This is actually impossible to do as the carrying handle on the Colt 733/727 is built into the weapon's receiver and cannot be removed. What would have been an accurate representation is that a rail mount is attached on top of the carrying handle, instead of it being removed." - Payday Wiki

Mount scopes on top of the carry handle instead of removing it, drop in mod_override, requires WeaponLibs.
Issue: Compact profile sight and magnifiers combo are not working.