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|  MIL-S-3443G (AR)
Plastic stocks and fore-ends shall conform to ASTM-D-4101-82
Propylene Plastic Injection and Extrusion Materials, using a
material designation of PP110 G20 or G30 A40440 or a material of
equal fire resistance and non-toxicity rating.
3.10.11 Recoil pad. The stock of the shotgun shall be
equipped with a one-inch thick (nominal) recoil pad which shall
be fastened securely to the stock and shall match the contour of
the stock within .015 inch. The screws attaching the recoil pad
shall bottom securely on the steel plate of the pad. The screws
attaching the recoil pad shall provide a minimum engagement in
the stock of one inch.
The material for the recoil
3.10.11.1 Recoil pad material.
pad shall conform to the requirements of ASTM D2000 as delineated
in specification ASTM D2000 M2BC 410 A1, B2, F1, Z1, Z2, Z3.
Special requirements for Suffix Z1, Z2, and Z3 are as follows:
Z1 .
Change in tensile strength after 30 days over
a.
water at 158 20F shall be minus 30 percent maximum..
No cracks shall be visible under 7X magnifi-
Z2 .
b.
cation after 30 days exposure in a relative humidity cabinet in
which the circulating air is controlled to 100 1F and 90 2
percent relative humidity. The color of the pad shall be brown,
30045 to 30140, or black, 37038 to 37056, in accordance with FED-
The hardness of the pad shall be within a Shore A
STD-595.
Durometer reading of 35 5. A suitable carbon steel plate shall
be molded within the recoil pad to provide for fastening it to
the stock. The exterior surfaces of the pad shall be solid
without cushioning cavities and shall show no evidence of the
Plugs for the screw holes shall be
internal metal plate.
provided of the same material as the recoil pad. They shall be
designed to provide retention in the recoil pad by the resilient
action of the rubber, and after assembly and bottoming on the
screw head, shall be flush to 1/16 inch below the surface of the
pad.
Z3 requirements shall be the same as ozone chamber
c.
exposure method A of ASTM D1171 except that the test duration is
7 days.
3.10.11.2 Recoil pad - alternate desiqn.
Stell Washer
molded into the recoil pad for fastening it to the stock are
Self-closing holes to cover the screw heads are
permissible.
permissible in place of the rubber plugs to prevent the intrusion
of foreign matter (dirt, water, ice, etc.).
13
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