For cowboys in a comic I’m working on. Renderosity doesn’t have one. Is there any 3d model maker who might have a set?

I drawn

Finding a rarity, particularly one that fits L'Homme, is indeed uncommon. Even locating such a set, the conversion process would pose a significant challenge.

should I then post that in marketplace challenges? my cowboy needs a snake-shooter!

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It's important to understand that vendors typically won't produce content that doesn't have a market. Your ideal scenario would be to find someone willing to design a gun and gun belt at no cost. However, you'll likely need to provide details on the desired appearance.

Agreed that vendors typically don't create niche products. Your best bet is to find something created for an older character and convert it yourself.

There is a "Wild West M3 Cowboy" set at DAZ that has a gunbelt and pistol included. 

Ah thanks