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No offense, but I'll never understand the idea that people will know what's in another person's head. You filed what? Where? Did you file the barrel down? The magazine tube? The part? Where on the part? You say you filed something but it would be much more helpful if you mention where you filed, and how much.
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I found his original instructions very clear... The part in question (what this very thread is about) needed to be filed to fit.. When u use a round file, you are 99% of the time filing a curved surface... So, upon looking at the part, there are only 2 possible curved surfaces.. The hole, and the radius that fits under the barrel.. Since he said you a file, and not drill out, you can assume he didnt perfectly increase the size of the hole by hand filing, which leaves only one option... No offense, but its pretty obvious as to what needed filing