electric7 Posted March 15, 2021 Share Posted March 15, 2021 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? Quote Link to comment Share on other sites More sharing options...
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