Thanks for all the suggestions! I ended up shaping styrene rod into the base and wrapping copper wire to get that oval shape. I'll have to try the lathe idea on my next LAV. It is adequate for this build which is mostly a warm-up after being away from modeling for so long.
After adding some detail, I realized the kit M60 wasn't correct so I decided to build the M240 with a new mount. Most of the machine gun was fabricated from styrene, but I decided to use a barrel from a Dragon kit. It's not done yet, but so far I think it has turned out pretty good. Thanks again!
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