Machine work to upper receiver

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01-13-20, 17:24
snackgunner

Machine work to upper receiver

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
01-13-20, 17:34
Inkslinger

Machine work to upper receiver

Never mind, I looked at your image. I thought you were talking about the anti rotation tabs.
01-13-20, 17:42
snackgunner

Look at the pic
It’s the g mk16 10.5”
01-13-20, 18:11
Inkslinger

Quote:

Originally Posted by snackgunner

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.
01-13-20, 19:11
Toyoland66

Post pics after it’s together, sounds like a robust setup.
01-13-20, 19:13
scooter22

That specific handguard is only available on a complete "Super Duty" upper.
01-13-20, 20:58
snackgunner

Quote:

Originally Posted by scooter22

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

Correct I ordered the super duty complete upper and am going to switch out the receiver
01-14-20, 13:13
scooter22

Quote:

Originally Posted by snackgunner

Correct I ordered the super duty complete upper and am going to switch out the receiver

Ah, sorry.

Do you really think the juice is worth the squeeze?

Do you want the MUR for possible increases in accuracy?
01-14-20, 23:22
snackgunner

Quote:

Originally Posted by scooter22

Ah, sorry.

Do you really think the juice is worth the squeeze?

Do you want the MUR for possible increases in accuracy?

Yes if it will not compromise the upper receiver it’s worth it to me to not have the forward assist. Geissele or some company produced upper receivers for their super duty uppers with these cutouts so I figured it would be safe for a competent gunsmith to do the same thing to a mur upper