Both of these arms: Davy Bazooka - Right Arm - Roblox, and more importantly, Davy Bazooka - Left Arm - Roblox have some component in them causing them to mimic some of the color from your left leg, as shown here:
However, in r15, this issue seems to resolve itself:
Thank you for flagging this. Can you be more specific on how you achieved this? We are not able to reproduce this.
The best thing is to write a step by step on how to reproduce this. Be very specific on what body parts you are using, and how you managed to get the skin tone to be the way you’re showing. This will help us troubleshoot this much easier.
Thank you!
That rig is in R15, you need to swap to R6. Here is my character wearing the Davy Bazooka arms, both in R15 and R6. I did not change body colors when swapping from R15 to R6.
The arms are fully pink aswell as the leg. From the example above, it seems the skintone for the arms is different than that of the legs yet combining. Try changing the skintone of the arms.
Btw this bundle was published in 2019 
Recreated the issue on a completely blank R6 Noob, and imported that into Studio with Roblox’s Rig Builder. You should be able to change the color of the arms using the BrickColor of the Left Leg.
DavyGreenArms.rbxm (19.7 KB)
Also worth noting is that, for whatever reason, these arms are being shaded as if the sun is coming from the opposite direction.
Thanks. We’re able to repro it now. Will take a look to see what’s going on.
most 2019/2020+ bundles that are not properly supported in R6 will have that weird shading
