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National Stock Number:
1005-01-328-5882
Federal Supply Class:
1005
National Item Identification Number:
013285882
Description:
BARREL,MACHINE GUN
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Manufacturer Information:
| 12929081 | 19200 | US ARMY ARDEC RDECOM |
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Techincal Specification:
| TYPE/MODEL DESIGNATION | M3 | | OVERALL LENGTH | 1143.0 MILLIMETERS NOMINAL | | INSIDE SURFACE TREATMENT | CHROMIUM, QQ-C-320, CLASS 2A | | SURFACE TREATMENT | PHOSPHATE MANGANESE AND PAINT | | SIZE DESIGNATION | .50 CALIBER | | SPECIAL FEATURES | PHOSPHATE IS NOT SAND BLASTED OR APPLIED TO INTERNAL SURFACESL SUPPLEMENTAL OIL TREATMENT IS APPLIED AFTER PAINTING; PAINT IS HEAT RESISTANT PER MIL-STD-193,COLOR NO. 15200 OF FED-STD-595,APPLIED TO SPECIFIC EXTERNAL SURFACES ONLY; CHROMIUM PLATING IS APPLIED ONLY TO INTERNAL SURFACES; NO MECHANICAL METHOD FOR REMOVAL OF CHROMIUM PLATEPERMITTED; PLATING WILL PRODUCE A CONTINUAALY DIMINISHING DIA. TOWARDS THE MUZZLE,EXCEPT THAT FROM THE ORIGIN OF RIFLING TO WITHIN 102 MM. OF THE MUZZLEND; A VARIATION OF 0.025 FROM A CONTINUALLY DIMINISHING DIA. IS PERMISSIBLE AND 0.013 VARIATION IS PERMISSIBLE OVER THE REMAINING LG. PROVIDED THAT RESULTANT SURFACES REMAIN WITHIN OVERALL DENSIONAL LIMITS FOR BORE AND GROOVE DIA.; HEAT TREATMENT IS TO HEAT BARREL AND PISTON AT 1550-1575 DEG. F.,OIL QUENCH,TEMPER 1 HR. MIN. TO ROCKWELL HARDNESS RC 28-36; GAS PORTS-HOLES ARE LOCATED WITHIN BARREL RIFLING GROOVES |
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