I'm trying to fit a a ULE body in a what I think is a RT Pro Rail and one little piece is stopping me.

The silver metal bump in front of the trigger screw. I already took out the spring but there's still a pin in there. The pin makes me think that it's two pieces. Is there a way to take the top part off the the body will sit flat in the rail.
Here's a side pic of the rail to help determine the rail.

The silver metal bump in front of the trigger screw. I already took out the spring but there's still a pin in there. The pin makes me think that it's two pieces. Is there a way to take the top part off the the body will sit flat in the rail.
Here's a side pic of the rail to help determine the rail.

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