Colt 6724 Rifle question

[Crow Hunter]

I had read in other posts that Colt was changing over the 6724 line to the "milspec" pin sizes on the lower to match their LE line.

Does anyone know what the serial number cut off for this change is?

I am in the market for one but I don't want to get one that doesn't match the pin sizes of my other Colt's.

Thanks