I do believe that is a genuine Baughman ramp and it is pinned to the sight base.
Here's a close up of the OP's front sight and the face of the blade is smooth. Baughman's were serrated.
Ive looked all over the front sight and still cant find the pin. If someone could post a pic of the pin on theirs id very much appreciate it. If you look very closely at my most recent pics of the front sight you will see that a small chip came off the red paint at some point. Where the chip is i dont see any bluing as well as any grooves. Id assume the previous owner ground down the grooves when they applied the paint
First off, nice gun! The sight modifications aren't a big deal to correct. The rear leaf is relatively simple to swap, but the front blade is best left to a professional. If I was going to have that front sight changed, I'd consider a gold bead or red post Patridge. It's important to get the correct height.
Here's what the blade pin looks like (in the right light, at the right angle). They're hard to see, because the ramp and blade were installed and the pins ground/polished flush, before the finish was applied.
In this photo of an earlier gun, you can see three pins. Two attach the ramp base to the rib and the third attaches the blade to the base.
Patridge front blades were standard on 6" and 8-3/8" Model 27's and your blade shape is substantially different from these factory Baughman blades on various 27's. Your blade is obviously a modified Patridge, not a Baughman with the serrations ground off.
If a customer ordered an otherwise standard gun with a special front sight, the factory would pull a gun from the vault and replace the front sight. It was far less disruptive to production than building a gun from scratch. In these cases, the pins were left proud (the ends radiused), to prevent them from having to refinish the barrel.