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Originally Posted by Raellus
A couple of the color plates in the Osprey book show M60Ds (helicoper door guns with spade grips and ring sights intead of a butt-stock and a pistol grip) mounted on gun trucks. It seems to me that, with very few aircraft still airworthy, this would be a natural use for old door guns.
It's almost ridiculous how many MGs some of those Vietnam-era gun trucks carried. We're talking 3-5 M2HBs and 2-4 M-60s per truck, in some instances. One even had two 7.62mm Miniguns! Most of them carried an M-79 too. I was surprised that none of the images in the book show AGLs as a gun truck weapon. I know that they were widely used on PBRs by the Brown Water Navy. I wonder why they never caught on as gun truck weapons.
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Speaking for the Vietnam-era AGLs, it was an experimental Honeywell design that was hand-cranked. The first real AGL is the XM-174 by Aerojet. Both designs used either a 12rd drum or a 50rd box and fired standard 40mm grenades (the barrel on the XM-174 is the same one fitted to a M-79).
GIs also took the time to strip any crashed gunships and stripped them of their M-75 40mm (Cobra) and the M-5 40mm (UH-1 gunships).
There is a photo in the national archieves that shows one gun truck fitted with no less than six 40mm AGLs!
There are also pics of twin M-60 mounts mounted on each corner of the truck bed.
Another favorite mounted on some gun trucks was the E8 35mm 16-tube CS gas grenade launcher, I've seen at least three pics that shows at least two of these units mounted.
If you have a chance to check out a copy of Shelby's Vietnam Order of Battle (pg 303), there is an great pic of a M-151 jeep, protected by sandbags and armed with a M-134 7.62mm minigun for the passenger and a Honeywell handcranked GL on a pedestal mount!