-Bbl Recently Purchased: Kotonics KT68 16" LW (LightWeight) Profile Bbl. Chrome Lined, M4 Feedramps.
Problem: Upon Arrival of bbl to my house, immediate foreign piece of "debris" noticed down the bore. Upon further inspection, this mysterious "debris", was actually a metal BURR, located on the backside of the gas port hole, drilled directly under where the F marked FSB will be mounted.
This gas port hole "BURR", located on the backside (in the bore of bbl), cannot be removed with patches (it just slowly tears/shreds them), and it even wears down a nylon bristle bore brush rapidly too.
SO, is this BURR, something that is normal, and always has to be removed when a gas port hole is drilled? I have a little machining experience, so I know that burrs always result when holes are drilled, so I'm wondering if this burr can be removed with a NOGA (or other brand) hand carbide deburring tool? They actually make a hand deburring tool, which is shaped for removal of burred edges located on the BACKSIDES of holes that are down in bores, or other hard to reach areas.
OR, is this burr going to be more like something that should have been caught and removed EARLIER during the bbl making process, (like BEFORE the chrome lining was applied?)
Can this burr be removed NOW with zero negative affect to the rifling and accuracy, OR is it too late, and this bbl will never be/shoot the same?
Damn. I have just had setback after setback on this build. It sure is going to be nice when it's done though! The good thing is that I know Tim at Kotonics will help me, and make this right. I will be calling him tomorrow for sure.
Thanks for any help guys. I just wanted to get some knowledge about this type of problem, before I call Kotonics tomorrow.
Other than this issue, the bbl sure looks nice, and has an excellent finish on it.
Any advice, thoughts, info appreciated.


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). consensus seemed to be that it wasn't an issue - but i hope some more knowlegeable folk will chime in to confirm that (or not).


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