How to create THESE guns with Bullets (no trace)

So in many games, I have seen this type of gun bullets below, and I was wondering how to do it
robloxapp-20200816-1457504.wmv (833.5 KB)

^^That is from Zeppelin Wars if you were wondering.
I searched and couldn’t find out how to do that.

Looks like it’s based off of Roblox’s assault rifle script.

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Sorry to bother you, but could I please have the link (couldn’t find it)