MIL-DTL-001298D (AR)
4.16 Barrel Erosion. M2 Barrels failing to remain within the requirements for barrel
erosion shall be cause for rejection of the lot of M2s. Each barrel used in the endurance test
shall be evaluated concurrently for barrel erosion.
4.17 Interchangeability. Ten M2s shall be selected from each lot, be inspected for and
shall comply with the requirements for firing pin protrusion, headspace, timing and firing pin
release before and after interchange of parts using the inspection methods specified in 4.5, 4.6,
4.7, and 4.8. M2s shall be tested for interchangeability by disassembling and then
reassembling parts using the parts and the prearranged system. Interchange of parts shall be
accomplished by dividing the parts of each machine gun into 10 groups of non-mating parts
as shown Tables III and IV (as applicable), and distributing the groups into 10 different trays
until each tray contains parts for a complete M2. Groups of parts from the first M2 shall be
taken in order and placed in trays 1 through 10 in that sequential order; groups of parts from
the second M2 shall be taken in order and placed starting at tray 2 through tray 10 and
finishing in tray 1; groups of parts from the third M2 shall be taken in order and placed
starting in tray 3 through tray 10 and finishing in tray 2; and so on. Commercial parts such
as screws, spring pins, etc., shall be placed in the same tray as their mating or associated
part. Any commercial part rendered unserviceable by disassembly shall be replaced without
penalty to the interchangeability test. The M2s shall be reassembled using only those parts
which are in the same tray. In addition, the M2s shall be tested for functioning requirements
3.10, and targeting and accuracy (flexible) or accuracy (turret type), 3.13 as applicable after
interchange of parts using the test methods specified in 4.11 and 4.14. Test frequency may
be reduced; by approval of the procuring agency, to not less than one test of ten M2s from
each lot when a record of consistently satisfactory results has been established. Failure of the
interchangeability test shall cause retest or rejection of the lot. An interchangeability retest
may be allowed without reconditioning the lot. Failure in the retest shall cause rejection of the
lot subject to reconditioning and further test as a reconditioned lot. A sample of 20 M2s from
each retest or reconditioned lot shall be tested using the same procedure described above.
4.17.1 Concurrent spare parts. At least two parts from each M2 inspection lot of
concurrent repair parts shall be subjected to interchangeability by disassembling two M2s,
previously tested in 4.16, as necessary, and then reassembling them using the concurrent repair
parts. Any modification of parts to fit is not allowed. The M2s shall operate and function
properly. This test shall be performed independently of the M2 interchangeability test
specified in 4.17 and at more frequent intervals using accepted M2s taken from current
production. Failure of any part to meet the requirements shall be cause for rejection of the
represented lot of parts subject to reconditioning and further test as a reconditioned lot. A
sample of double the number parts used in the original test shall be tested from each
reconditioned lot.
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