Was wondering if anybody makes WWII-Modern military rifles in 1/24?
IIRC, that’s about 75 or 80mm, in figure terms. You might see if there are figures available in that scale that has the weapons you need. The other option is the old fashioned way, scratch building. If that’s what you’re left with, don’t be intimidated, it’s not as bad as it might seem. It’s worth a try.