MIL-DTL-46709F(AT)
3.4.1.3.7 Cannon and mount.
3.4.1.3.7.1 Exercising of recoil mechanism. When it has not been exercised, proof fired,
overhauled, or manufactured within 4 months prior to preparation for storage or shipment, recoil
mechanism shall be exercised a minimum of three extensions of recoil piston. Replenisher
assemblies shall be exercised concurrently with the recoil mechanism. After exercising, the
replenisher shall be filled to the bleed position with hydraulic fluid conforming to MIL-H-6083,
then drained to operating level. The extension shall be a minimum of 6 in. (152.4 mm). The
record of exercising shall be entered on DA Form 2408-4 and proof testing of the weapon shall be
entered in DA Form 2408-9 (see 3.4.1).
3.4.1.3.7.2 Cannon. Immediately after cleaning, the bore and chamber of the cannon
shall be coated with lubricating oil conforming to VV-L-800. Excess preservative shall be
allowed to drain from coated surfaces. A strip of volatile corrosion inhibitor (VCI) treated
barrier material conforming to class 1, style C, form A of MIL-P-3420 shall be cut and rolled into
a tube with the VCI treated surface on the outside. The barrier material shall be of a size that
shall provide a continuous cover for the bore and the chamber surface. The rolled barrier material
shall be inserted into the cannon extending the entire length of the bore and chamber. The barrier
tube shall not be forced or kinked in a manner that will obstruct the chamber. The cannon shall
remain in battery with the cannon tube secured in the travel lock position.
3.4.1.3.7.2.1 Muzzle opening. A muzzle plug shall be provided for the muzzle end of the
cannon (see figure 4). The muzzle plug shall be inserted securely into the muzzle opening. The
muzzle plug shall be secured with tape conforming to type 1, class 1 of ASTM D5486, 2 in.
(51 mm) (minimum) wide. For tubes with the muzzle brake installed, three strips of tape shall
extend across the muzzle plug, through the muzzle brake openings, and back onto the sides of the
muzzle brake for 4 in. (102 mm). The tape shall be reinforced with a circumferential wrap of tape
applied a minimum of three full turns over the muzzle brake surfaces. For tubes with the muzzle
brake removed, two pieces of tape shall be applied across the center of the plug. The strips shall
be perpendicular to each other and extend 4 in. onto the surface of the gun tube. The tape shall
be reinforced by applying a strip of tape circumferentially around the joint between the plug and
the tubes, and then applying three additional turns of tape around the tube, extending from the
muzzle to 4 in. behind the muzzle. The muzzle and (if applicable) muzzle brake shall be covered
with a polyethylene bag 0.006 in. (0. 15 mm) thick conforming to type 1, class 1, grade A, finish 1
of L-P-378. The bag shall be of sufficient length to extend a minimum of 10 in. (254 mm) onto
the gun tube. The bag shall be secured with strips of 1 x 12 in. (25.4 x 304.8 mm) tape
conforming to type 1, class 1 of ASTM D5486. The tape shall be run lengthwise on the top,
bottom, and sides of the tube, so that approximately half of each strip is on the bag and half on the
painted surface of the tube. Additional tape (6 in. (152 mm) width) of the same material shall be
applied around the circumference of the tube to form a continuous seal, extending from the lip of
the bag, 3 in. (76 mm) onto the gun tube, and 3 in. onto the bag. Two additional strips of tape
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