Four-post weapon station only.

There is one and only one machine gun mount kit that can be used on the M939-series truck: machine gun mount kit, NSN 1005-01-432-3339, which is a 4-post lightweight weapon station. To mount the weapon station, you must also install the cab reinforcement kit, NSN 2590-01-436-9144, to prevent damage to the cab.

The only machine gun mounts that can be used with the lightweight weapon station are the MK93 Mod 1, NSN 1005-01-383-2757, which is covered by TM 9-1005-245-13&P, and the MK64 Mod 9, NSN 1010-01-412-3159, which is covered by TM 9-1010-231-13&P. Eventually, a new version of TM 9-1005-245-13&P will cover both mounts.

The only weapons safety certified to date for this weapon station are the MK 19, M2, and M60 machine guns. It's important to use a catch bag with the mounts to prevent spent casings and links from falling into the cab and possibly injuring the driver.

Some units have tried substituting the 3-post M66 mount that's used on most other trucks. That's a bad mistake. The M66 mount can't be properly stabilized and secured to the M939's platform. In as few as 100 miles on the road, the cab can suffer structural damage. This damage can become so severe that the cab can slide over the truck frame or the mount can work loose during firing. Either situation could be fatal for someone.

If you have installed M66s on your M939s, remove them ASAP and order the 4-post ring mount and the cab reinforcement kit.

Direct support installs the weapons station and cab reinforcement kit. The weapons ring comes with the mount kit. For parts info on the ring mount, see Fig 602 in TM 9-2320-272-24P-2.

For additional info on the M939's mount, contact William Jensen at DSN 793-3677/ [phone] or email:

[e-mail] 

or Barbara Painter at DSN 793-4403/(309)

782-4403 or email:

[e-mail]