Nickberg500
Ultimate Member
Bought a 9mm upper recently, the seller thought it had a 1/2 x 36 thread. Just tried to put a 1/2 x 36 flash can on it, and it only goes on a few full rotations before it binds up. I tried cleaning the threads (they were a little dirty) with ballistol, that didn't seem to help.
What does this mean? Are they not the correct threads? Am I doing something wrong? Pic attached.
What does this mean? Are they not the correct threads? Am I doing something wrong? Pic attached.
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