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Military HMMWV Pedestal Post Mountings
Closed top HMMWVs use a machine gun ring mount on the roof, but open bed (pick-up truck style) HMMWVs can have a machine gun mounted to the front or rear of the bed by the use of a pedestal mount. This is similar to the long-established use of post mounts in military jeeps. Several different models of pedestal mount have been used with HMMWVS.
High Mobility Multipurpose Wheeled Vehicle (HMMWV) Mount, Pedestal, M4
The M4 Pedestal Mount is a metal tube with a floor plate and support brackets. At the top is the pintle receiver. It is used with the HMMWV to mount the M60 7.62mm Machine Gun using the Mount, M142 to cradle the weapon. Other machine guns could be mounted to the M4 with proper cradle mounts or adapters. The M142 mount was commonly used with the M4 pedestal on the M151 jeep, one of the vehicles replaced by the HMMWV. An accessory bracket to the M142 holds a 200-round ammunition can.
Mount, Pedestal, M6
Mount, Pedestal, M6 (NSN 1005-01-411-6341) is the standard HMMWV mount for the M249 5.56mm Squad Automatic Weapon (SAW). As with the other pedestal mounts, other machine guns could be mounted to the M6 with proper cradle mounts or adapters. Mount, M197 (NSN 1005-01-413-4098) mates the M249 SAW or M240B MG to the HMMWV M6 pedestal mount.
The Mount, M6 had an annoying set of four diagonal braces that supported the pedestal on the base, but created a tripping hazard for the gunner or anyone who had to pass the mount point. It also lacked a depression limiter that left the possibility of accidental fire into the cab of the vehicle.
M6L Pedestal Mount
In 2003, mechanics from the 101st Corps Support Group, working with other units in Iraq, created the M6L Pedestal Mount for HMMWVs and other vehicles. By the summer of 2003, there was a shortage of the standard Mount, Pedestal, M6 just as the need was increasing to equip convoy and patrol vehicles. Using local facilities in the Kurdish-populated area in northern Iraq, the M6L ("L" for Local) was designed and manufactured.
After numerous rounds of design and re-design to make the mount more rugged, serviceable, and low-cost, production began 5 August 2003 and quickly ramped up to 200 per week. Not only did the M6L Mount meet the troop's requirements, but it was produced at one-third the cost of the military standard M6 Mount.
The M6L Mount design overcame a number of problems with the Mount, M6. In the HMMWV, the M6 was designed and tested to be mounted near the front and required bolt holes to be drilled which then damaged the vehicle body from the constant stress of use. The M6L design uses existing holes near the rear of the HMMWV cargo bed, between the wheel wells, to make the mount more secure and stable. The M6L Mount has a larger flat base plate that can be left in the HMMWV for blast protection when the pedestal itself is not needed for a mission. A simplified support system for the post makes change-over possible in a matter of minutes.
Other features on the M6L include an ammo basket and a security attachment ring for the gunner to strap onto in order to keep from falling out of moving vehicles. An added safety feature is the depression limiter so the weapon cannot be fired into the front seats.
This very successful field-developed unit was approved by Tank and Automotive Command and the designation M6L was standardized.
Mount, Pedestal, M7
The improved features of the M6L Mount design led to the Mount, Pedestal, M7 (NSN 1005-01-518-9037), a pedestal that mounts the M249, M240B, and M2 Machine Guns and the MK19 Grenade Machine Gun in the open cargo bed of the HMMWV. As with the M6L Mount, the Mount, M7 is designed to be installed in the rear of the HMMWV cargo bed, between the wheel wells where it provides a 360° range of fire.
The Mount, Pedestal, M7 has a full HMMWV bed-width base made of aluminum armor plate with alternate pedestal mounting locations and standard attaching points. Compared to the M6 Mount it has a superior ruggedized column support configuration which reduces the tripping hazard of the M6 and possible breaking of the support braces. There is also a depression stop which ensures safe zones of fire when aiming forward, preventing shooting into the cab area.
The M7 Mount is produced at the Joint Manufacturing and Technology Center at Rock Island Arsenal, IL, with about 4,500 units going to U.S. Army units in Iraq by the end of 2005.
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