John Thomas recommended me a gunsmith to do this work. I ordered a super duty Geissele complete upper . The rail and upper receiver have a key lock tab for anti rotation purposes. Being a lefty I don’t like upper receivers with forward assists. I’m going to have him replace the factory Geissele upper with a vltor mur upper (no fa). He’s going to machine a recess into the vltor mur upper for the rail to lock into it with the key tab.
Would doing this to a vltor mur upper compromise or weaken the upper?
Pic
https://imgur.com/a/UCqLLX6
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