Machine work to upper receiver

[snackgunner]

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

[Inkslinger]

Never mind, I looked at your image. I thought you were talking about the anti rotation tabs.

[snackgunner]

Look at the pic
It’s the g mk16 10.5”

[Inkslinger]

Look at the pic
It’s the g mk16 10.5”

Roger. I didn’t scroll down far enough before I commented. My uneducated guess would be that you would be able to mill the MUR without weakening anything. I highly doubt that Geissele had any super proprietary uppers forged for them in order to mill that slot out.

[Toyoland66]

Post pics after it’s together, sounds like a robust setup.

[scooter22]

That specific handguard is only available on a complete "Super Duty" upper.