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really I have been reading a lot about it. Looks like a lot of the precision upper builders are doing it.
Well since I am third in the MOA thread and I did it to my gun today we will see if it can take a 3/4 MOA gun and make it better. Same ammo next weekend with a glued barrel.
Looks like a good experiment.
I would first direct you to my use of the word maybe...which wasn't an accident.
I have noticed that in the last two uppers I've put together when I bedded things that they were more consistent. Not necessarily more accurate, but across all recorded groups there was less deviation. A dropping of "flyers" as it were.
I think that using a quality, tight-fitting upper receiver, such as the BCM4, would do more good than using Loctite.
To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--
Don't get me wrong. I completely agree that a tight fitting upper is the most ideal solution. Not wanting to completely jerk BCM off, they only have a say in half of the equation. The barrel extension also has an effect here. So unless you are in a position to test fit many different parts to find the most ideal fit, bedding is just a tool to have in your back pocket should you find that your purchased parts aren't quite ideal.
Permatex 640 is good to 400F - Mil-R-46082B Type II - static sheer at 300F - 1500psi
Loctite 609 is good to 300F - Mil-R-46082B Type I - static sheer at 300F - 1000psi
Both met Mil-R-46082B which requires -65 to 300F temp range.
The normal clearance filling ability of the retaining compounds is as follows: Type I -.004 inch, (,0.102mm) Type II -.008 inch (0.203mm). For optimum strength and cure, the clearance should not exceed .002 inch (0.058mm). (From the Mil-Spec)
yep
I Disassembled my upper. degreased the barrel extension and inside of the receiver with brake cleaner. put a nice coat of red 271 Loctite on the receiver extension. Slid her home and cleaned up my overruns. screwed on the barrel nut to 35# of torque. took the assembly off the reaction rod and with qtips cleaned up the excess on the inside of the receiver/barrel extension. got it standing in a corner with the receiver up. Will let it dry till Friday.
last weekend I shot the MOA challenge before gluing in the barrel. That is pretty much what this gun averages. I am in third place. This Saturday I will use the same bullet and load and shoot the challenge again. We will see if there is any improvement.
Who believes there will be improvement? not?
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