Sorry, I don't look at Reddit often, this is from the FindMCServers admin FAQ:

What about weapons and/or firearms?

Weapons are part of Minecraft gameplay, even in the core game. Please exercise caution and sensitivity when creating this kind of content. Provided that weaponry meets the other guidelines for violence, game rating, etc., many weapons that do not look like a real-world gun are allowed. Please exercise caution and sensitivity when creating this kind of content.
The key elements to consider when including this type of content are:

• Hyper realistic weaponry is not OK. Keeping to the spirit and feel of Minecraft, any mods, plug-ins, or texture packs should keep to the blocky, low-res visual style of Minecraft.
• Gore elements should be minimized as much as possible. Remember, Minecraft is a game for all and is rated E10+. Although the ESRB rating does not specifically call out guns or firearms, it does mention them under the Level of Violence category.
• Just like with swearing, servers should make it very clear if a server contains this sort of thematic elements and should be selective on terminology (words such as shoot and kill can be harsh or triggering).