Technical data

TM 9-1005-319-23&P 0008
0008-21
Table 1. Preventive Maintenance Checks and Services for
M16 Series Rifles and M4 Series Carbines - Continued.
Item
No.
Interval
Man-
Hour
Item To Be
Checked or
Serviced
Procedure
Equipment Not
Ready/Available
If:
Rifle Only
f. Cracks in the critical area at
the front end of buttstock are
not acceptable. Under the
following conditions, hairline
cracks (no chipped away
material allowed) originating
from the buttplate end of the
buttstock are acceptable.
f. Buttstock is
cracked in
critical area or
does not meet
crack criteria.
(1) One hairline crack, not to
exceed 1 in. (2.54 cm) in
length, per side of
buttstock.
(2) Two additional hairline
cracks up to 0.25 in. (0.64
cm) in length, per side of
buttstock.
(3) A total of three cracks per
side of buttstock,
originating from buttplate
end, is allowable.
1 v s 0 4 8
C R I T I C A L A R E A