Make flintlock guns
I suggest the creation of flintlock style/renaissance guns which fire calimacil foam bullets and use toy gun caps to make a realistic effect. Perhaps something similar to the spring mechanics used in nerf guns could be used.
Urban Disgrace commented
There are many larps which would use renaissance guns if there was a weapon company that made larp safe flintlocks. Calimacil could be the only provider of high quality, foam firing, larp safe, flintlock guns in the global larp community.