Contractor to provide labor material and equipment (as well return freight) for the following: 

31 EACH - PERFORM THE ION NITRIDE PROCESS ON THE 120MM M256 BREECHBLOCK - ADL PER NOTES #2 & #3 OF DRAWING 12528572 SHEET #1 REV A & QAP REV A. ESTIMATED 9 LOTS WITH SIZE RANGING FROM 1 TO 4 EACH. 

24 EACH - PERFORM ION NITRIDE PROCESS PER SAE AMS2759/8, EFFECTIVE CASE DEPTH 0.20 TO 0.60. EFFECTIVE CASE DEPTH HARDNESS 40 HRC, SURFACE HARDNESS 85.5 HR15N MIN PER NOTE 7 OF DRAWING 12529521 REV L. MASK ALL THREADS & AREAS INDICATED BY CROSS HATCHING (SHEET 6) NOTE 7A & 7B. ESTIMATED 5 LOTS WITH SIZE RANGING 3 TO 6 EACH.