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So I'm curious about the serial numbers and why there are different letter designations. Look at all the ACRs and there are also BFI, ACR, and XACR. Noveske, Blue Force Gear, Unity, Remington, Bushmaster, DPMS,. I decided to call Bushmaster today and was told by them that they started up a second factory to produce AR15s due to high demand. The new serial numbers were produced last fall at the new production facility. The older L series are still being produced at the original facility. So now you can get a Bushy with either prefix.