John,
The TK-2 kit did not use the M23 mounting system that Army hueys did. A you can see in the photo, the 60's were mounted inboard of the rockets and the rocket pod would have been a seven shot LAU-59/A, which is essentially the same as the Army's XM-157 pod. However, you will find pictures of pods pained white as well as OD since the the marines sometimes used air Force pods. T he mounting system for the 60 inside the cabin is similar to the Sagami mount, but that system was originally developed to be mounted outside the ship and later adapted to the M23 universal mount. I've never seen one mounted inside before. the key to the Sagami mount is it's swing out design.
Here's another picture of that same TK-2 system to give a better view head on of the mount and the 60C's:
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Here are a few Echo's from the Mutza gunship wlkaround (you gotta have that book by the way):
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I like this one with the XM-18 minigun pod:
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You'll note both these birds are built after bravos not Chralies as was the standard later on
Hope that helps,
Ray