If the seller didn't already claim it you can. FNH has no way to know how many times a 4473 has been done on the same gun. The only thing that matters is if a rebate claim has been made on the serial number.Madhouse said:I made a deal with a guy for a NIB PS90. Do you think there's any chance I could send in for this sight, if the guy selling it hasn't? I forgot to ask him if he has it.