Getting a roblox missing arm script to work correctly can be a bit of a headache if you aren't sure how the engine handles character models. Whether you're trying to create a hardcore survival game where players can lose limbs, or you just want a specific NPC to have a unique look, there are a few different ways to go about it. Most people think you can just click the arm in the explorer and hit delete, but as soon as the player respawns or an animation plays, things start getting weird.
If you've spent any time in Roblox Studio, you know that the character model is a complex beast. It's not just a collection of parts; it's a hierarchy of joints, motors, and scripts that all have to talk to each other. When you want an arm to go missing, you have to tell the game exactly how to handle that void so it doesn't break the rest of the player's movements.
Why you might need a missing arm script
There are plenty of reasons why you'd want to use a roblox missing arm script. One of the most common is for "damaged" states in combat games. Imagine a player gets caught in an explosion, and suddenly their character model changes to show they've taken a serious hit. It adds a layer of realism (or at least, blocky realism) that makes the gameplay feel more impactful.
Another big reason is for character customization. Maybe you're building a shop where players can buy "cybernetic" parts, but before they equip the new arm, the script needs to hide the default one. Or maybe you're making a horror game where the protagonist starts with one arm—classic trope, but it works every time for building tension.
The difference between R6 and R15
Before you start writing your roblox missing arm script, you absolutely have to know which avatar type your game is using. This is the part where most beginners get tripped up.
R6 is the classic, old-school Roblox look. It only has six parts: the head, torso, and four limbs. In R6, the arm is just one single part called "Right Arm" or "Left Arm." It's super easy to script because you're only dealing with one object.
R15, on the other hand, is a bit of a nightmare for limb manipulation. The arm is split into three pieces: the UpperArm, the LowerArm, and the Hand. If you want the whole arm to go missing, your script has to target all three parts. If you only remove the UpperArm, you'll end up with a weird, floating hand and forearm following the player around like a ghost. It looks hilarious, but it's probably not what you're going for.
Making the arm invisible vs. destroying it
When you're writing your roblox missing arm script, you have two main options: you can either Destroy() the part or set its Transparency to 1.
I usually recommend going the transparency route. Here's why: if you destroy the arm part, any animations that rely on that arm might throw errors in the output. The animation engine will be looking for a "Right Arm" to move, and when it finds nothing, it gets confused. By just making the arm invisible and turning off its collisions, the game still "thinks" the arm is there for animation purposes, but the players won't see a thing.
To do this, your script basically needs to find the character, locate the specific limbs, and set their Transparency to 1. You also want to make sure you set CanCollide to false. You don't want the player bumping into invisible walls because their "missing" arm is still hitting things.
Handling the script on spawn
One of the most annoying things about a roblox missing arm script is that it often resets when the player dies. By default, when a character respawns, Roblox loads a fresh, complete model from their avatar settings.
To fix this, you need to use the CharacterAdded event. This is a bit of code that sits in the server (usually in ServerScriptService) and waits for a player to spawn. As soon as the character model appears in the workspace, the script kicks in and hides the arm again.
If you don't do this, the player will have a missing arm for their first life, but as soon as they trip over a lava brick and respawn, they'll be back to having two arms. It totally ruins the immersion.
The problem with Motor6D joints
Inside every Roblox character, there are things called Motor6D joints. These are what connect the limbs to the torso. If you use a roblox missing arm script to just delete the arm, you're also deleting the joints that hold the hand to the arm (in R15).
If you're trying to do something fancy, like replacing a missing arm with a hook or a robot hand, you have to be careful not to break these joints. Usually, the best way is to keep the joints intact but just swap out the "Part0" or "Part1" properties to link the new object to the torso. It's a bit more advanced, but it prevents the "floating limb" syndrome that plagues a lot of low-effort Roblox games.
Adding some extra polish
A roblox missing arm script that just makes a part disappear is fine, but it's a bit boring. If you want your game to stand out, you should add some visual flair when the arm goes missing.
Think about adding a particle emitter. If it's a sci-fi game, maybe some blue sparks coming out of the shoulder joint where the arm used to be. If it's a zombie game, well, you know—lots of red particles. You can even add a sound effect that plays at the exact moment the arm is "removed." These little touches are what separate a "meh" game from something people actually want to play.
Testing your script in Studio
Once you've got your roblox missing arm script written, don't just assume it works for everyone. Roblox has a million different avatar configurations. Some players use the "Blocky" body, some use "Man" or "Woman," and some use those weird, tall "Rthro" packages.
You should test your script using the "Test" tab in Roblox Studio. Change your avatar to a few different packages and see if the script still finds the right parts. Since Rthro models have different naming conventions sometimes, or different mesh scales, your script might need to be flexible enough to find "RightUpperArm" regardless of what shape it is.
A quick note on LocalScripts vs. ServerScripts
If you put your roblox missing arm script in a LocalScript, only the player who owns that character will see the missing arm. Everyone else on the server will still see them with two arms. This is fine if you're doing a UI effect or something that only matters to the player, but for a gameplay mechanic, you absolutely need to use a ServerScript.
Using a server-side script ensures that the change is replicated to every single person in the game. It's a small detail, but it's the difference between a functional mechanic and a glitchy mess that only one person can see.
Wrapping it up
Working with a roblox missing arm script is a great way to learn about character hierarchy and how Roblox handles body parts. It seems like a small thing, but once you master hiding and showing parts of the character model, you can do all sorts of cool stuff, like custom armor systems, limb-loss mechanics, or even full-blown character transformations.
Just remember to keep an eye on your R6 versus R15 settings, use CharacterAdded to keep the effect persistent, and maybe add a few spark particles just to keep things interesting. It takes a little bit of trial and error to get the joints and transparency exactly right, but once it's dialed in, it adds a whole lot of personality to your project. Happy scripting!