I submitted online on 2017-05-04.

If it doesn't appear on the status page by a day or two before the end of the rebate promotional period (2017-06-30), I'm going to physically mail in the rebate form (with a tracking number).

I believe as long as it's postmarked by the 30th, it should be good-to-go.

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Colt 45 M1911/S&W M&P Shield 9