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Oh man, who did that? Isn't there someone who can reprofile it to the 6933 barrel? Anyone have a pic or the measurements?
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If you cut an M4 barrel down to 11.5", that puts the treaded muzzle right where the M4 "notch" was and you get the results I showed above which is functional but kind of ugly. The work was done by ADCO but there was a communication breakdown as I asked about that before hand and they told me it wasn't a problem. I thought that meant the notch would be completely removed after the cut and re-thread. They meant it would show but wasn't an issue
To their credit, they made it right once I let them know I was not happy. Basically they milled the shoulder back and made a filler piece to take up the space.
Not a great close up pic but good enough to get the idea. If you look closely, you will see a line about 1" back from the crush washer. Looks just like a profile line but that is the break between the new shoulder and the filler piece. Other then that line you can't tell by looking at it and functionally, this barrel shoots better now then before it was cut down (originally an 14.5" LMT barrel)