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+--- Thread: Squaring & Lapping the Upper Face (/showthread.php?tid=7093)
Squaring & Lapping the Upper Face - Keep The Change - 01-21-2014
MikeGideon Wrote:This is an OK video. Don't forget to grease your threads before you install the barrel nut. I would also check inside the receiver and make sure none oozed out there. So far, that hasn't happened on the ones i've done.
http://www.youtube.com/watch?v=Wgw6MhO83Fg
Yeah I use the Aero Shell 33MS that meets the Mil Spec Barrel Nut requirements. I bought a little container of that from the Umbrella Corporation.
https://www.ucwrg.com/materiel/miscellaneous-components/18/aeroshell-33ms-grease/
Squaring & Lapping the Upper Face - waveslayer - 01-21-2014
Great thread! I installed my new barrel and it was way off once I installed the handguard. I lapped it last night after reading this thread and the other one started by LR. Now it's straight as an arrow!
Squaring & Lapping the Upper Face - Keep The Change - 01-22-2014
waveslayer Wrote:Great thread! I installed my new barrel and it was way off once I installed the handguard. I lapped it last night after reading this thread and the other one started by LR. Now it's straight as an arrow!
Glad that worked out for you. So what was happening to make you realize that it was off, after putting the handguard on?
Squaring & Lapping the Upper Face - explorecaves - 01-22-2014
Keep The Change Wrote:Glad that worked out for you. So what was happening to make you realize that it was off, after putting the handguard on?
If it is off, then the barrel will not be centered when it exits the hand guard
Squaring & Lapping the Upper Face - Tedward - 01-22-2014
explorecaves Wrote:If it is off, then the barrel will not be centered when it exits the hand guard
What kind, mil-spec or billet, and brand of upper was it? Just for knowledge of what brands are that much off.
Squaring & Lapping the Upper Face - GMinor - 01-22-2014
Just from watching this thread and my experiences with MEGA uppers, I don't think I'll ever build on a milspec forged upper again.
Squaring & Lapping the Upper Face - MikeGideon - 01-22-2014
GMinor Wrote:Just from watching this thread and my experiences with MEGA uppers, I don't think I'll ever build on a milspec forged upper again.
I don't know. I would say the same if I'm going for precision. If I'm just gonna slap an Eotech on it, and use it for close-in blaster stuff, a forged upper is fine for me.
Squaring & Lapping the Upper Face - waveslayer - 01-22-2014
Tedward Wrote:What kind, mil-spec or billet, and brand of upper was it? Just for knowledge of what brands are that much off.
It was a RRA upper. You could tell it was off after installing the hand guard... it wasn't pretty! I would have had to install a NightForce scope to get enough windage adjustment to make up for it.
Squaring & Lapping the Upper Face - waveslayer - 01-22-2014
Tedward Wrote:What kind, mil-spec or billet, and brand of upper was it? Just for knowledge of what brands are that much off.
It was a RRA upper. You could tell it was off after installing the hand guard... it wasn't pretty! I would have had to install a NightForce scope to get enough windage adjustment to make up for it.
Squaring & Lapping the Upper Face - BjornF16 - 01-23-2014
GMinor Wrote:Just from watching this thread and my experiences with MEGA uppers, I don't think I'll ever build on a milspec forged upper again.
My AA uppers are mil spec forged...they are square.
Squaring & Lapping the Upper Face - customcutter - 01-23-2014
Forged or billet really isn't going to make a difference in the squareness of the receiver to the bore. That is going to be a function of the machining and how accurately the machines are set up and capable of holding tolerances.