I hate the internet.
I hate the internet.
I used to lap the receiver face, etc. Then, a well distinguished high power shooter said that either the USMC or AMU stopped the practice as they saw no real benefit to the practice.
He shoots better in his feet than I do in the prone.
ETA: stupid phone submitted my post before I was done typing.
Last edited by muad; 04-15-18 at 11:19.
Parts have gotten better, if you buy good parts. In the last ten rifles I've assembled using DD, BCM, and a couple ARP 6.8 barrels. All using Aero uppers, I have pretty much had to resort to a plastic mallet to get the barrels into the uppers. No shim stock is going to fit in there, and I don't really see any need to loctite them either. I also seriously doubt that I could much improve on the barrel's grouping through gunsmithing. I see far better results from proper load development. All of which is a waster of time if you can't make a good wind call, or don't have good shooting fundamentals.
Use a hair drier or a heat gun on those tight uppers to get the barrel in.
Why???
Expands the receiver just enough to accept the barrel extension and when it cools it will tighten up on it. This of course only if the receiver is a tight fit/oversized barrel extension.
Scroll through for science post:
https://diy.stackexchange.com/questi...bolt-loosen-it
Last edited by sidewaysil80; 04-16-18 at 06:24.
In my experience chasing tiny groups there are measurable gains in accuracy and there are theoretical gains in accuracy. A match barrel and trigger will result in measurable gains in accuracy, All the other voodoo is theoretical. For example if we took a stock M4 and swapped out the barrel with a Krieger it would shoot measurably better. If you took the same M4 and did nothing but swap the receiver for a thicker MUR would it shoot measurably better?
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