I am assuming your K-1 form is from an 1120-S tax return.
Box 17, code K is for dispositions of property with section 179 deductions, so K1_179 just refers to that.
If this amount is from an installment sale you should have an attached statement that says so. Check to see if there is a K-1 statement that has additional information for box 17, code K. If there is no such statement, you can assume it was a regular sale.
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