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I'm looking for an upper assy. for my M4 project and I find several listed by DSA and Model 1 Sales. Anyone have any info on either company? I don't even know if they have any but wanted to find out about them before I called.
I'm building my first M4 and just got in the extension tube kit. How much torque should be used on the castle nut? Also, the weight in the buffer is loose. Is that normal?
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