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Late 2020 M4 serial with IT next to it


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Hey, just wanted to see if anybody had seen this.  I bought a couple M4's, both 2020 serials.  They both have a Y starting serial, but one, the higher serial one, has an IT stamp after the serial.  Also, the IT one is parkerized jet black.  The other has the bluish parkerizing.  Wonder what changed at the factory?

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