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AR lapping/bedding test thread.

I'm gonna be "that guy" that says to always refer to loctite by it's number, and not it's color. There are several of each color, and they're different! There are probably 6 different "green" loctite products.


@Rocketvapor - Yeah, If I know I have a good barrel, I'll just glue it in. It's permanent, but uppers are cheap and 223 barrels last forever.
Loctite 638 is what I've heard most use.
 
That will work. I use 620. It's good for slightly higher temps, which probably works against me if I ever wanted to take these things apart.
 
One of the illinois highpower guys says he whacks them out with a dowel and hammer through the receiver and he says it works with all the different loctites.
I also use dowel.
If heat isn't applied, I can't get them out with a medium strength retainer.
With low strength ones, no heat needed - just a few good whacks.
 
I use permatex sleeve retainer. Depending on the upper i will put the barrel in a barrel vise and use a rubber mallet to knock the receiver off of the barrel. With the sleeve retainer I do use a little bit of heat then 2-3 mallet strikes and its off.
 
I use permatex sleeve retainer. Depending on the upper i will put the barrel in a barrel vise and use a rubber mallet to knock the receiver off of the barrel. With the sleeve retainer I do use a little bit of heat then 2-3 mallet strikes and its off.
Where on the upper are you hitting?
 
I will hold around the rear of the receiver to support it and i strike the area at the front that the gas tube goes through. This is not gorilla bashing it. Add a bit of heat, rubber mallet, few light to moderate strikes and they come off.


Edited to add a photo from the internet. Hold firmly in the yellow circle, strike the red circle.
 

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Before on left, after on right.


Wind was a lot more tricky today than for the original shots. For this rifle, I'll admit no improvement. Worth noting that the barrel/upper were a good/snug fit to begin with. The rifles I've seen success with before were like a hotdog down a hallway.


1716076170837.jpeg
 
Before on left, after on right.


Wind was a lot more tricky today than for the original shots. For this rifle, I'll admit no improvement. Worth noting that the barrel/upper were a good/snug fit to begin with. The rifles I've seen success with before were like a hotdog down a hallway.


View attachment 1556113
I take it that you felt comfortable that the wind did not significantly impact the 'after' groups?
 
I'd say net-net it's the same. The wind was all over the place today.. first test was pretty smooth from one direction. This range kills me at 200. If I went out to 500, put up flags, and took my time, I'd have the same size groups. We don't call it our toilet bowl for no reason :)
 

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