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M4/AR15 Barrel drawing?

One thing that I have wondered about for a long time is how do you deburr the inside of the gas port?
Lol, I've had several commercial barrels with a chip left in the gas port from drilling. It's one of the first things I check along with length of gas journal. Some are machined for gas block to butt up against the end and others leave room for the triangle clip to hold clamshell hand guards.
 
If I'm being honest I don't know a whole lot about the pros/cons of different length systems. For this one I just cloned a WOA varmint barrel. They use their own length gas system - It was 11.125 from the extension to the gas block shoulder
The longer the gas system the better unless its blackout. For Target work the mid length or rifle length is better because the bullet has left the barrel before the bolt opens so less movement. With the carbine gas system the bolt is moving by the time the bullet exits.
 
One key to this, is not using a tool that creates a large hard burr. Reamers tend to roll a burr. Hole size does not need to be held that close.
 
One thing that I have wondered about for a long time is how do you deburr the inside of the gas port?
Use a very sharp (new) drill bit .010” or more undersize of target diameter and follow up with the proper size very sharp (new) drill bit. Deburr with a few bullets down range.
 

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