Depends on the friend. Do you have an approximate round count for each of them? If you can tell us what they are , we might be able to provide some additional insight.
A field strip should be enough. The overall visual inspection, function check and Bob's your mother's brother. That's assuming they are fairly clean. If they are a good friend and you trust them, a field strip may not be needed but definitely an overall visual and function check with all magazine if they are semi auto.
More like an acquaintance (or friend of a friend, or I know a guy), then field strip, look closely with flashlight, check barrel rifling, remove grips if removable (ask if that's OK). You won't be able to look too deeply without further disassembly so just be thorough with what you can reach/see. Remember, just because it shows wear doesn't mean it's worn out.
If you're unfamiliar with the specific firearms, watch a few vids on each and ask the friend to field strip and reassemble.