I didn't see anyone reply to your question on the QD for the Sionics rail. Now that you have yours, this might be a moot point, but I just got an upper today and the QD on my HSP sling doesn't lock in. I can pull it out with a moderate amount of force. It very well could be user error and I have yet to call Sionics to confirm. Does your example exhibit the same behavior?
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