Sorry, I meant receivers together. Instead of down. I have filed the bolt catch down a lot. I had it removed completely while I was having the issue. I used sandpaper to perform your mod#2. It took 4 hours of sanding in that little spot, but now I can finally rack the bolt if I hold the gun with my knees and pull on the charging handle with both hands.
I'm going to keep working on this tomorrow.
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