It should not sit flush with the outside. But it should be close to it.
My own R92 has the flat portion of the face around the scalloped out part of the gate sitting .05 to .058" lower than the side face of the reciever. It also does not touch the edge of the actual gate anywhere around the edge of the port. The outward motion is stopped by the spring seating in the clearance slot inside the receiver.
When I did my buddy's gate I had to remove a little metal and add a taper to the front edge of the gate and receiver opening. Also it was binding the gate in the opening a little at the rear which was not the spring seating. Once I cleaned those up the gate was properly part way out but a touch low along the lines of measurements like I mentioned.
A way to test for where it is binding is to use a narrow 1/8" slip of paper and see where the gate is pinching against the edges of the opening. Kiss a little metal away with a small jeweler's file and try again. It's fussy work but at least you only need the gate and the one screw. It's not like you need to pull the gun apart totally, make a little change then put it all back together again.
When it passes the slip of paper fit test it should be fine after that.
I also had to slightly tweak my buddy's spring so that the gate sat parallel to the outside face when in place along and during the metal trimming.
Because of the bending of the spring to do this I ran it through a "settling in heat treatment". It's a trick I picked up from making my own springs from music wire. Heat the part up to 425 to 450F in a toaster oven and after a 20 minute soak drop the temp about 50F every 15 minutes until it's at warm. Then shut off and allow to cool fully. The spring will now "remember" the new shape and be a lot more durable.
Don't worry, the 450F is well below the "blue" temperature used to temper the metal to be a spring in the first place. This is just a sub temper treatment to make it happy with the new position by relieving the stresses from actually bending it out of shape slightly.