Accoutrement

An Accoutrement welds its child part called "Handle" to the player's character. You can change the position and rotation of the Handle part using the AttachmentPos, Right, Forward, and Up properties.

Parts descending from an accoutrement are massless when attach to other parts (e.g. with a Weld) as long as they are not the root part of the assembly that GetRootPart() returns. GetMass() returns 0 for parts in this case, and it doesn't add to the total mass or rotational inertia of the Assembly.

This doesn't apply to a part descending from an accoutrement when an accoutrement welds to another part that is massless or one if its parts otherwise becomes root. This also doesn't apply for the root part, and it has mass like a normal part.