Hello!
It's a pity you didn't include a link...
And I think Saco makes 1:1 M60s. But sometimes when you're looking for weird stuff in an usual scale or stuff in weird scale shapeways can be your only option:
https://www.shapeways.com/marketplace?tag=m60
Another thing is - who needs 1:24 weapons? OK, there are some auto modellers who do, like for a police cruiser (most likely not M60 though). Then there's the 1:24 Huey - but still I imagine that the market for such stuff is tiny. Most likely perfect for 3D print on demand.
Thanks for reading and have a nice day
Paweł